Solid State Guitar Amp Forum | DIY Guitar Amplifiers

Solid State Amplifiers => Amplifier Discussion => Topic started by: joecool85 on May 23, 2006, 10:45:46 AM

Title: Who wants a power amp kit for free? **Out of LM3886 kits**
Post by: joecool85 on May 23, 2006, 10:45:46 AM
Brian shipped out a bunch of amp kits to me for me to distribute to you guys.  All I need is money for shipping.  I'm not totally sure what will be in the box, but he said that there is stuff for around 10 amps.  Anyway, there should be LM3886 and LM1875 kits.  Whoever wants one, post here and reserve one before someone else does!  I know RDV was interested in a LM3886 and a LM1875 last I knew...
Title: Re: Who wants a power amp kit for free?
Post by: javacody on May 23, 2006, 12:58:38 PM
I'd like an LM3886 kit. How much do you think shipping will be? Paypal ok?
Title: Re: Who wants a power amp kit for free?
Post by: joecool85 on May 23, 2006, 01:22:55 PM
Paypal will be excellent.  I can't imagine shipping would be more than like...$8 or something.
Title: Re: Who wants a power amp kit for free?
Post by: SECONDandBOWERY on May 23, 2006, 02:11:51 PM
Could I get a LM3886 kit?  I don't have a paypal account set up, so is there any other way I could pay you for shipping?

Rock'n'Roll,
--Andy
Title: Re: Who wants a power amp kit for free?
Post by: joecool85 on May 23, 2006, 02:19:06 PM
I'm not sure how many of each kit he sold me, but if there are enough, you can have one as well.  A check would be fine, but I would wait till I get it in the bank before I ship the boards.
Title: Re: Who wants a power amp kit for free?
Post by: RDV on May 23, 2006, 03:04:15 PM
You know me, just email me the paypal bill once you know what it will be. I'm most interested in the LM1875, but I've got 2 toroids just ready to power something. The 20 + 20 200VA would work for the LM1875 one for sure. If that's not enough, I've got the 400VA one too.

RDV
Title: Re: Who wants a power amp kit for free?
Post by: SECONDandBOWERY on May 23, 2006, 06:27:49 PM
I take back what I said before - my dad will let me pay for this via his paypal.

Rock'n'Roll,
--Andy
Title: Re: Who wants a power amp kit for free?
Post by: DreamSeller on May 25, 2006, 10:08:11 AM
Am I able to get a LM3886 Kit and pay via direct deposit into a bank account? Dont have a credit card.

Thanks

-Dream
Title: Re: Who wants a power amp kit for free?
Post by: joecool85 on May 25, 2006, 10:23:50 AM
Do you have paypal?  If not you can always send me a check or money order if you have to.
Title: Re: Who wants a power amp kit for free?
Post by: DreamSeller on May 25, 2006, 10:58:05 AM
Ok cool, I will go with money order if thats alright with you.

Could you please PM me with shipping costs and details of where to send.

Thankyou for your generosity with this

-Dream
Title: Re: Who wants a power amp kit for free?
Post by: joecool85 on May 25, 2006, 11:13:21 AM
Thank Brian, he is the one setting us up with freebie kits :-)
Title: Re: Who wants a power amp kit for free?
Post by: DreamSeller on May 25, 2006, 11:19:53 AM
Sorry  :-[

Thanks Brian  :)

-Dream
Title: Re: Who wants a power amp kit for free?
Post by: joecool85 on May 25, 2006, 03:26:44 PM
I have a 25.2volt 2 amp (approx 50VA) CT transformer (12.6+12.6) that would be good for a LM1875.  With that voltage it would yield 15watts, plenty for a practice amp.  It's a new in package transformer I grabbed from radio shack.  I don't need it now but I got a good deal on it.  I'm willing to let it go for $10 plus s/h.

**edit**
It'd be a little bit of a stretch, but it would power a LM3886 to 40watts.
Title: Re: Who wants a power amp kit for free?
Post by: RDV on May 25, 2006, 07:41:08 PM
My 36vct 56VA only made 30 watts with an LM3886. It was loud though.

RDV
Title: Re: Who wants a power amp kit for free?
Post by: joecool85 on May 25, 2006, 07:49:42 PM
Really?  Hmm.  I got that figure from the datasheet not from actually testing.
Title: Re: Who wants a power amp kit for free?
Post by: teemuk on May 25, 2006, 08:05:30 PM
If the theoretical maximum efficiency of a class B amplifier is approximately 71% then efficiency of class AB has to be bit less than this. Then there's losses in the power supply too. I'd say around 1/2 of VA rating is a good rule of thumb for maximum output power of SS class AB amp.
Title: Re: Who wants a power amp kit for free?
Post by: joecool85 on May 25, 2006, 08:06:24 PM
Ah, good point.  I was shearly going by voltage ratings.  Regardless, it should be perfect for a single LM1875 application.
Title: Re: Who wants a power amp kit for free?
Post by: RDV on May 25, 2006, 08:31:48 PM
R.G. did the math, I'm not that smart! That's probably a conservative figure because it was every bit as loud as it's been with more powerful transformers.

RDV
Title: Re: Who wants a power amp kit for free?
Post by: RDV on May 25, 2006, 11:02:03 PM
That transformer will work for an LM3886.

Gain Bandwidth    3 MHz
SupplyCurrent Per Channel    50 mA
Supply Min    18 Volt which is a [v+] + [v-] value
Supply Max    84 Volt
Output Current    11500 mA

Gotta have at least 9v per rail.

RDV

I had to fix this. I was wrong.
Title: Re: Who wants a power amp kit for free?
Post by: joecool85 on May 26, 2006, 07:26:29 AM
For one, it doesn't matter because its just plain old to small, for two, I think thats +/-18 not that it needs 18v per rail.  Regardless it is still perfect for a LM1875.
Title: Re: Who wants a power amp kit for free?
Post by: joecool85 on May 26, 2006, 08:59:58 AM
The transformer is now listed in the swapmeet section: http://www.ssguitar.com/index.php?topic=170.0

Any further conversation about it should be directed there or PM me questions.
Title: Re: Who wants a power amp kit for free?
Post by: joecool85 on May 26, 2006, 02:12:47 PM
Alright, I have one LM3886 kit ready to ship.  I should have enough for a few more LM3886 kits as well as a handful of LM1875 kits, but Brian forgot to send a few things to complete the kits so it will take a little while to work that out.

If I'm correct, Javacody, you asked for the LM3886 first.  So if you paypal me $5 to joseph.raymond@umit.maine.edu and give me your shipping address, I'll get it right out to you.

**Instructions for putting the kit together are available at chipamp.com**
Title: Re: Who wants a power amp kit for free?
Post by: SECONDandBOWERY on May 26, 2006, 02:15:30 PM
I've got dibs on the next LM3886 after Javacody!

Rock'n'Roll,
--Andy
Title: Re: Who wants a power amp kit for free?
Post by: joecool85 on May 26, 2006, 02:17:54 PM
Yup, you do and I will get one to you as soon as I can.  If you want I could set you up with the kit as is missing a few things and you could get the missing stuff off jameco.com for cheap.
Title: Re: Who wants a power amp kit for free?
Post by: RDV on May 26, 2006, 02:18:57 PM
I think thats +/-18 not that it needs 18v per rail.
Those are one and the same.

RDV
Title: Re: Who wants a power amp kit for free?
Post by: SECONDandBOWERY on May 26, 2006, 02:22:22 PM
I'd prefer to get the entire kit as a whole, if that's at all possible.

I'll PM you my paypal info after you get those last few components.

Rock'n'Roll,
--Andy
Title: Re: Who wants a power amp kit for free?
Post by: joecool85 on May 26, 2006, 02:27:21 PM
Whoops, got me there RDV.

And 2nd, thats fine.  As soon as the rest of the stuff comes in from Brian I will ship you out one.
Title: Re: Who wants a power amp kit for free?
Post by: RDV on May 26, 2006, 02:27:31 PM
I stand corrected.
The LM3886 will run on that transformer.
The 18v min is a [v+] + [v-] value which could even be 18vct.

RDV
Title: Re: Who wants a power amp kit for free?
Post by: joecool85 on May 26, 2006, 02:43:29 PM
^^ Haha!!! I'm right!
Title: Re: Who wants a power amp kit for free?
Post by: javacody on May 26, 2006, 11:59:59 PM
Payment sent. I accidentally sent you $1.50, so I sent another payment for $3.50 after that. Doh!  ;)
Title: Re: Who wants a power amp kit for free?
Post by: joecool85 on May 27, 2006, 10:00:49 AM
In the mail. 

It was only $1.50 or so to mail it, but due to the cost of the packing envelopes as well as the time to sort out the kits, I will still charge $5 flat rate shipping.
Title: Re: Who wants a power amp kit for free?
Post by: javacody on May 27, 2006, 07:17:44 PM
Heck, your travel time alone is probably worth $5.  Thanks Joe!
Title: Re: Who wants a power amp kit for free?
Post by: joecool85 on May 27, 2006, 08:02:18 PM
Thanks for being part of the DIY amp community! 

btw, there are two things you should after you make the kit (this applies to anyone getting these freebie kits):

1.  Thank Brian - bb@darg.net

2.  Post your build report (with pics if possible) right here on SSGuitar.
Title: Re: Who wants a power amp kit for free?
Post by: DreamSeller on May 28, 2006, 05:39:53 AM
Ive joined the line for an LM3886.

-Dream
Title: Re: Who wants a power amp kit for free?
Post by: joecool85 on May 28, 2006, 07:42:50 AM
Alright.  It looks like I'm only going to have two more LM3886 kits, so that means SecondandBowery and DreamSeller get LM3886 kits.  I should have at least 3-4 LM1875 kits though.  I know RDV wants at least one.  Anyone else?
Title: Re: Who wants a power amp kit for free?
Post by: RDV on May 28, 2006, 01:23:26 PM
Just let me know when to shoot you the funds. Are you still waiting on some parts?

RDV
Title: Re: Who wants a power amp kit for free?
Post by: SECONDandBOWERY on May 28, 2006, 01:32:11 PM
Just let me know when to shoot you the funds. Are you still waiting on some parts?

Ditto.

Rock'n'Roll,
--Andy
Title: Re: Who wants a power amp kit for free?
Post by: joecool85 on May 28, 2006, 01:54:24 PM
Yeah...still waiting on parts.  I have one LM3886 kit that all it needs are the AC connect terminals and another that just needs those as well as a 10uF 50v cap.  If someone wants one of the incomplete kits, I can ship them out.  Not sure how long it will take Brian to get me stuff since he is normally pretty busy.

I'm not sure what the LM1875 kits need exactly because I ran out of diodes for those.  I may have some lying around from a shipment Brian gave me a while ago though.  I also don't have any LM1875 ICs, he forgot to put them in the box lol.  If anyone is interested, I can try to throw together a couple LM1875 kits and see whats missing.
Title: Re: Who wants a power amp kit for free?
Post by: SECONDandBOWERY on May 28, 2006, 04:23:57 PM
Are the AC connect terminals something that could be bought for cheap at a radio shack?

Rock'n'Roll,
--Andy
Title: Re: Who wants a power amp kit for free?
Post by: joecool85 on May 28, 2006, 05:31:15 PM
Not sure if radioshack would have them or not.  I would guess not.  As far as I know you could solder the transformer's secondary wires straight to it instead of using the connects.  I'd want someone to verify the safety of that first though.
Title: Re: Who wants a power amp kit for free?
Post by: SECONDandBOWERY on May 28, 2006, 06:13:47 PM
I'll just wait until you have them to ship, then.

Rock'n'Roll,
--Andy
Title: Re: Who wants a power amp kit for free?
Post by: joecool85 on May 28, 2006, 06:32:12 PM
K.  I sent an email to Brian, so hopefully we can get the ball rolling and get the rest of these kits ready to ship out.
Title: Re: Who wants a power amp kit for free?
Post by: DreamSeller on May 28, 2006, 11:18:58 PM
Cool, just tell me when and where to send the funds

Thanks

-Dream
Title: Re: Who wants a power amp kit for free?
Post by: SECONDandBOWERY on May 29, 2006, 08:54:20 PM
Cool, just tell me when and where to send the funds

Once again, ditto.

Actually wait, I know where, just tell me when!

Rock'n'Roll,
--Andy
Title: Re: Who wants a power amp kit for free?
Post by: joecool85 on May 30, 2006, 07:33:45 AM
Not a problem.  If Brian doesn't email me back today I'll try to catch him on aim and see when he can get me the rest of the stuff.
Title: Re: Who wants a power amp kit for free?
Post by: joecool85 on May 31, 2006, 09:08:49 AM
javacody, if you could, just post when you get the kit in the mail, I'd appreciate it.  Thanks :-)
Title: Re: Who wants a power amp kit for free?
Post by: javacody on May 31, 2006, 01:25:19 PM
Sure, it came yesterday. Man, those caps are big.  :)  Can anyone recommend a heatsink source that might be local to me? Radio Shack?
Title: Re: Who wants a power amp kit for free?
Post by: joecool85 on May 31, 2006, 01:29:30 PM
Radio Shack doesn't carry any heatsinks even remotely close to big enough.  eBay is your best bet as far as I know.  This will give you a good idea of what you want: http://www.ssguitar.com/index.php?topic=175.0
Title: Re: Who wants a power amp kit for free?
Post by: joecool85 on June 01, 2006, 12:00:02 PM
Brian sent out the stuff.  I should have two LM3886 kits ready in a couple days, as soon as the stuff gets here.  Those will go to Dreamseller and SecondandBowery.  I need to order a couple things from digikey to get the other kits together because brian was out of a few things.
Title: Re: Who wants a power amp kit for free?
Post by: RDV on June 01, 2006, 02:14:49 PM
Let me know what you spend and I'll include it in the paypal.

RDV
Title: Re: Who wants a power amp kit for free?
Post by: joecool85 on June 01, 2006, 02:16:38 PM
It's looking like $30ish, I'm going to wait till the stuff comes in from brian to make sure I won't need anything else.  I'd feel bad for you to pay all that ricky.  But if you want to (or anyone else for that matter) wants to include a little extra, you guys know where to paypal it to  ;)
Title: Re: Who wants a power amp kit for free?
Post by: RDV on June 01, 2006, 04:01:06 PM
I'll gladly pay for the extra stuff it'll take for one LM1875 kit. Whomever takes the other kit(s) should share their part as well. It's still quite a bargain. I've got everything I'll need including an enclosure(another dead CD player).

RDV
Title: Re: Who wants a power amp kit for free?
Post by: joecool85 on June 01, 2006, 04:16:06 PM
Ah, ok.  That'll be like $5 or so.  So it'd end up being $10 with shipping for a stereo LM1875.
Title: Re: Who wants a power amp kit for free?
Post by: RDV on June 01, 2006, 05:14:42 PM
You're getting 6 stereo LM1875 kits?

RDV
Title: Re: Who wants a power amp kit for free?
Post by: joecool85 on June 01, 2006, 06:39:57 PM
yup.  Want more than one?
Title: Re: Who wants a power amp kit for free?
Post by: RDV on June 01, 2006, 07:08:36 PM
We'll see, there may be more takers, though a 5.1 system with them might be cute. We're gonna be busy soon with these fellas who haven't built one yet. You remember how many questions you asked, right? They're gonna be asking the same stuff. I'll try to help of course!!

RDV
Title: Re: Who wants a power amp kit for free?
Post by: joecool85 on June 01, 2006, 08:06:21 PM
I'm ok with that though, I like answering questions.  Makes me feel smart.  There should be plenty of LM1875s to get you enough for a 5.1 since I think you are the only one that has even expressed interest in any of them.  Plus the LM1875s are unmarked boards, no C1,C2,R1,R2 etc to go by.  You just have to go by the schematic and a couple pics and stuff.  It's not a hard build, but not a beginner's one either.  The good news is, since I've done one I can answer any questions one might have about it.
Title: Re: Who wants a power amp kit for free?
Post by: joecool85 on June 05, 2006, 11:38:04 AM
Alright, 4 more LM3886 kits are ready to go.  Just send me $5 via paypal to joseph.raymond@umit.maine.edu

If you want more than one kit, ask first.  I want to make sure I have enough to go around.  Also, if you want to send a couple bucks extra (or even like 50cents) that would help to offset the cost of me ordering extra parts for the LM1875 kits.

**edit**
Kits will be shipped via USPS priority.
Title: Re: Who wants a power amp kit for free?
Post by: DreamSeller on June 05, 2006, 10:02:59 PM
Can you send me details of where to send the money order?

-Dream
Title: Re: Who wants a power amp kit for free?
Post by: joecool85 on June 06, 2006, 07:30:12 AM
If you are doing a money order, I'll PM you the address.

PM sent
Title: Re: Who wants a power amp kit for free?
Post by: joecool85 on June 06, 2006, 07:49:15 AM
Anyone want a free soldering iron?  It's a little beat but still works. I grabbed a new one the other day and have no use for this one.

Here is what it is:
http://www.radioshack.com/product/index.jsp?productId=2062730&cp=&origkw=soldering+iron&kw=soldering+iron&parentPage=search

15w/30w RadioShack soldering iron.

I'll ship it for free with any of the poweramp kits I'm giving away, or for free with the transformer I have for sale in the swapmeet section.
Title: Re: Who wants a power amp kit for free?
Post by: SECONDandBOWERY on June 06, 2006, 12:59:19 PM
Can I have the soldering iron?

Rock'n'Roll,
--Andy
Title: Re: Who wants a power amp kit for free?
Post by: joecool85 on June 06, 2006, 01:03:33 PM
Consider it yours.  As soon as you paypal me the $5 for the LM3886 I will ship it out all together.
Title: Re: Who wants a power amp kit for free?
Post by: SECONDandBOWERY on June 06, 2006, 01:11:33 PM
Thanks!  You should probably get the $5 today.  Since I don't have paypal myself, I asked my dad to send you $5 from his account and he said he would sometime today if he gets a chance.

Rock'n'Roll,
--Andy
Title: Re: Who wants a power amp kit for free?
Post by: joecool85 on June 06, 2006, 01:44:15 PM
Rockin'!  Is that going to be the correct shipping address on his paypal?  If not, go ahead and either email me or PM me the right shipping address.
Title: Re: Who wants a power amp kit for free?
Post by: SECONDandBOWERY on June 06, 2006, 01:54:57 PM
Yeah it'll be the right address.

Rock'n'Roll,
--Andy
Title: Re: Who wants a power amp kit for free?
Post by: joecool85 on June 06, 2006, 02:11:30 PM
Cool.  I got it all boxed up, as soon as the money comes in I'll ship it out.

I should note that I will be away tomorrow and thursday, back on friday and gone on saturday.  After all that I will be back for a while.
Title: Re: Who wants a power amp kit for free?
Post by: joecool85 on June 06, 2006, 03:25:38 PM
The money came in and I shipped it out.  It's in the mail, priority.
Title: Re: Who wants a power amp kit for free?
Post by: SECONDandBOWERY on June 06, 2006, 03:31:41 PM
Thanks, Joe!

I'll let you know when I get it in and I'll try really hard to document the build and put a build report.

Rock'n'Roll,
--Andy
Title: Re: Who wants a power amp kit for free?
Post by: joecool85 on June 06, 2006, 03:41:29 PM
Nice, build reports are always good!  Feel free to ask any questions you may have when you are putting it together.  I didn't print out a manual for you, but you can get it at chipamp.com
Title: Re: Who wants a power amp kit for free?
Post by: SECONDandBOWERY on June 06, 2006, 03:47:01 PM
I'm sure I can handle printint out the manual.

Rock'n'Roll,
--Andy
Title: Re: Who wants a power amp kit for free?
Post by: joecool85 on June 06, 2006, 03:48:29 PM
I should hope so  ;D
Title: Re: Who wants a power amp kit for free?
Post by: DreamSeller on June 08, 2006, 02:39:42 AM
Money Order Sent

-Dream
Title: Re: Who wants a power amp kit for free?
Post by: joecool85 on June 08, 2006, 10:14:25 PM
K.  I'll mail it out as soon as I get the money order in.
Title: Re: Who wants a power amp kit for free?
Post by: SECONDandBOWERY on June 09, 2006, 03:19:35 PM
Just got the kit and soldering iron in the mail!

Golly gee willikers - I sure am excited!

Thanks Joe!

Rock'n'Roll,
--Andy
Title: Re: Who wants a power amp kit for free?
Post by: joecool85 on June 09, 2006, 03:26:17 PM
Did it come in alright?  I would have sent you some solder with the iron, but I'm running out myself.
Title: Re: Who wants a power amp kit for free?
Post by: SECONDandBOWERY on June 09, 2006, 03:33:30 PM
Yeah it came in fine.  Don't worry - I have enough solder.

A few questions before I start putting this thing together:
1) Should I seperate the Power Supply PCB from the LM3886 PCB?  There is a scored line between the two and it doesn't look like any traces would be broke it I snapped it.

2) Do I need to heatsink the LM3886 while I'm soldering it?

Thanks again!

Rock'n'Roll,
--Andy
Title: Re: Who wants a power amp kit for free?
Post by: joecool85 on June 09, 2006, 03:49:43 PM
Yes you will want to break them apart.  You don't want the power super close to the amp section, you will get hum.  Plus the amp section can be hung off the heatsink via the LM3886 without problems, thats how I did mine.  As far as heatsinking the LM3886 while soldering, I wouldn't bother, it can take a ton of heat.  Unless you REALLY stink at soldering, it won't be a problem.  If you are worried, do a couple pins, let it cool, then do some more.
Title: Re: Who wants a power amp kit for free?
Post by: joecool85 on June 11, 2006, 09:47:42 AM
I have 2 more LM3886 kits available, someone who wants one, speak up!
Title: Re: Who wants a power amp kit for free?
Post by: Fixr1984 on June 11, 2006, 10:34:05 AM
I would like one.
Title: Re: Who wants a power amp kit for free?
Post by: joecool85 on June 11, 2006, 10:49:43 AM
Just paypal me $5 to joseph.raymond@umit.maine.edu and I will ship it out tomorrow morning.
Title: Re: Who wants a power amp kit for free?
Post by: Fixr1984 on June 11, 2006, 11:03:13 AM
Payment sent, I added a little bit extra for all the time you put in here.
And I'm sure you will be giving me lots of answers later. 8)
Title: Re: Who wants a power amp kit for free?
Post by: joecool85 on June 11, 2006, 11:34:17 AM
Thanks  :)

I'll pack it up today and ship it out tomorrow morning, Priority mail.  And as for the questions, thats what we are here for  :tu:

Feel free to tell your friends about us here as well!
Title: Re: Who wants a power amp kit for free?
Post by: bassman4d521 on June 12, 2006, 09:29:37 AM
Any left?
Title: Re: Who wants a power amp kit for free?
Post by: joecool85 on June 12, 2006, 09:38:08 AM
Yup, I have one left.  Paypal me $5 and it's yours.
Title: Re: Who wants a power amp kit for free?
Post by: bassman4d521 on June 12, 2006, 10:42:04 AM
Cool - I just sent the payment.
Rich
Title: Re: Who wants a power amp kit for free?
Post by: steve_m on June 12, 2006, 10:54:51 AM
Are there any kits left?

Regards,

steve
Title: Re: Who wants a power amp kit for free?
Post by: joecool85 on June 12, 2006, 11:30:52 AM
There aren't any more LM3886 kits, but I do have the 2 more boards and ICs.  So you would just have to get the resistors and capacitors.  If anyone is interested in that I will sell the power board, amp board and a LM3886 chip for $2.50, basically the shipping cost.
Title: Re: Who wants a power amp kit for free?
Post by: steve_m on June 12, 2006, 11:34:42 AM
Cool, can I have the boards? What address can I send the paypal payment?

steve
Title: Re: Who wants a power amp kit for free?
Post by: joecool85 on June 12, 2006, 12:27:38 PM
Fixr1984 and bassman4d521 - your kits are in the mail.
DreamSeller - I'm waiting for your money order to come in still
Steve_m - How many boards/ICs do you want?  I'll do one for $2.50 or both for $4 if you want them.

The address for paypaling me is joseph.raymond@umit.maine.edu
Title: Re: Who wants a power amp kit for free?
Post by: steve_m on June 12, 2006, 12:57:57 PM
If nobody wants another board, I'll take both.

steve

Title: Re: Who wants a power amp kit for free?
Post by: joecool85 on June 12, 2006, 01:14:06 PM
Consider them yours, just paypal me $4 and I'll send them out.

As far as other boards are concerned, I have 4 more sets, but no LM3886 chips or anything.
Title: Re: Who wants a power amp kit for free?
Post by: RDV on June 12, 2006, 01:18:14 PM
I'm sending you $2.00 for one of the boards and I'll be good for 2 stereo LM1875 kits when they come in.

RDV
Title: Re: Who wants a power amp kit for free?
Post by: joecool85 on June 12, 2006, 01:45:23 PM
RDV, you mean just a board no chip right?  Cuz I'm all out of chips.

If anyone else is interested, I still have 4 more amp/power boards and 2 separate power boards without the amp section.  $2 for one board (doesn't matter wether its just power or power and amp), add $0.50 on for each board after that.
Title: Re: Who wants a power amp kit for free?
Post by: steve_m on June 12, 2006, 02:01:39 PM
Joseph,

Payment sent from my ebay/paypal account: steves_basement.

Thanks!

steve
Title: Re: Who wants a power amp kit for free?
Post by: RDV on June 12, 2006, 03:19:14 PM
RDV, you mean just a board no chip right? Cuz I'm all out of chips.

If anyone else is interested, I still have 4 more amp/power boards and 2 separate power boards without the amp section. $2 for one board (doesn't matter wether its just power or power and amp), add $0.50 on for each board after that.
Just one board. No chip.

RDV
Title: Re: Who wants a power amp kit for free?
Post by: joecool85 on June 12, 2006, 04:46:36 PM
Steve and RDV, they're in the mail.  RDV, sorry but I had to mail it regular mail because I couldn't afford priority on both, I hope that's ok.
Title: Re: Who wants a power amp kit for free?
Post by: RDV on June 12, 2006, 04:53:22 PM
Not a prob.

RDV
Title: Re: Who wants a power amp kit for free?
Post by: joecool85 on June 12, 2006, 04:57:14 PM
Rockin'

I sent you an amp/power board since I didn't know if you wanted just the amp board or not.  Plus I don't have any separate amp boards and already do have separate power boards I don't know what to do with  :P
Title: Re: Who wants a power amp kit for free?
Post by: RDV on June 12, 2006, 06:21:39 PM
I know what to do with them! I've got a box of 10,000µF caps looking for a home.

RDV
Title: Re: Who wants a power amp kit for free?
Post by: joecool85 on June 12, 2006, 09:59:58 PM
Do you want them?  I've got two of them sitting around.  They are yours for $2 if you want them.  I can sell them for $5 if you want it priority.
Title: Re: Who wants a power amp kit for free?
Post by: Christian G on June 12, 2006, 11:29:24 PM
Are they all gone?
It sounds like you might have some left...
I want one!
Title: Re: Who wants a power amp kit for free?
Post by: joecool85 on June 13, 2006, 07:07:03 AM
This is what I have left:

4 x amp+power boards (no chips, resistors or caps, just the boards)

Any of the boards are $2 a piece, if you want more than one it will be $0.50 more per board. (So 2 boards would be $2.50, 3 boards $3, 4 boards $3.50).  And if you want it shipped priority, add $3.
Title: Re: Who wants a power amp kit for free?
Post by: joecool85 on June 13, 2006, 11:56:53 AM
RDV, the power boards are in the mail.
Title: Re: Who wants a power amp kit for free?
Post by: petemoore on June 13, 2006, 01:31:27 PM
  Sign me up if you still have one.
  I'd be glad to build it, press it into services, and respond back with 'feedback'...how the amp works.
  petemoore59@hotmail.com
Title: Re: Who wants a power amp kit for free?
Post by: joecool85 on June 13, 2006, 01:55:06 PM
I don't have any kits left, if you want a board, look up to reply 102 and it lists what I have for what price.
Title: Re: Who wants a power amp kit for free?
Post by: RDV on June 13, 2006, 02:12:26 PM
Hey Pete, if you get a PCB from Joe, we'll fix you up with a parts list and stuff.

RDV
Title: Re: Who wants a power amp kit for free?
Post by: joecool85 on June 14, 2006, 01:16:20 PM
DreamSeller, your kit is in the mail!   :tu:  Should be there in 4-6 days.
Title: Re: Who wants a power amp kit for free?
Post by: DreamSeller on June 15, 2006, 04:07:25 AM
Sweet, Cant Wait!

-Dream
Title: Re: Who wants a power amp kit for free?
Post by: joecool85 on June 15, 2006, 08:09:08 AM
This is what I have left:

4 x amp+power boards (no chips, resistors or caps, just the boards)

Any of the boards are $2 a piece, if you want more than one it will be $0.50 more per board. (So 2 boards would be $2.50, 3 boards $3, 4 boards $3.50).  And if you want it shipped priority, add $3.
Title: Re: Who wants a power amp kit for free?
Post by: Aharon on June 15, 2006, 08:35:55 AM
Hi Joe,as per conversation,I'd love a couple of PS boards or anything you can do,no problem.
Let me know where to send $2.
Thanks a lot
Aharon
Title: Re: Who wants a power amp kit for free?
Post by: joecool85 on June 15, 2006, 08:46:00 AM
PM sent
Title: Re: Who wants a power amp kit for free?
Post by: DreamSeller on June 15, 2006, 10:17:20 AM
Just curious whats the best way to set these LM3886s up?

Are they better as a head and cabinet deal or just a simple all in one? Can they they cleanly drive a 4x12 or a 2x12?

-Dream
Title: Re: Who wants a power amp kit for free?
Post by: joecool85 on June 15, 2006, 10:47:03 AM
I'm using mine as a PA and driving a dean markley 1x10.  I can't vouch for a 2x12 or 4x10.  I think RDV is using his on a 2x12 though.
Title: Re: Who wants a power amp kit for free?
Post by: teemuk on June 15, 2006, 11:33:29 AM
Speakers do not require a specific power to be driven. Period.

http://colomar.com/Shavano/speaker_design.html
http://colomar.com/Shavano/spl.html
Title: Re: Who wants a power amp kit for free?
Post by: stobiepole on June 15, 2006, 08:54:42 PM
I'd be interested in a couple of boards - I'm planning to build a little stereo guitar amp. What's left? And where do I send the money? Thanks, Chris.
Title: Re: Who wants a power amp kit for free?
Post by: joecool85 on June 15, 2006, 09:01:58 PM
I have 2 sets left, each set consisting of an amp board and a power board.  $2 for one set, $2.50 for both.  Paypal the money to joseph.raymond@umit.maine.edu
Title: Re: Who wants a power amp kit for free?
Post by: stobiepole on June 15, 2006, 09:15:22 PM
Sold. Paypaling you now...
Title: Re: Who wants a power amp kit for free?
Post by: RDV on June 15, 2006, 10:04:28 PM
I'm using mine as a PA and driving a dean markley 1x10.  I can't vouch for a 2x12 or 4x10.  I think RDV is using his on a 2x12 though.
I was driving my 412 @ 16 ohms last time I had it plugged in.

Lately I'm working on my DIY stereo speakers more than anything. AADD you know.

RDV
Title: Re: Who wants a power amp kit for free?
Post by: joecool85 on June 15, 2006, 10:07:15 PM
And I'm out of LM3886 boards.  LM1875 kits soon to come.  They should be about $10 a piece, but I won't know for sure until I place my order for the missing parts.  I'll keep you guys updated.  It's taking longer than expected due to an immense interest in the LM3886 kits as well as other projects keeping me tied up.
Title: Re: Who wants a power amp kit for free? **Out of LM3886 kits**
Post by: DreamSeller on June 17, 2006, 07:19:23 AM
Ive just looked at the chipamp website and the power supply has me confused.

Im not even going to attempt to build the power supply before I understand a few things, I figure this is the best place to ask them.

1. I need help on which transformer to use, Ive made stuff to plug into mains before but that was using an AC transformer which was storebought to power the circuit which was a 12v regulated power supply

2.Which fuses? Ceramic, M205, 3AG,

These are my main concerns at the moment that I would like to overcome before attempting the power supply.

*EDIT* OK after reading a bit more I think what I need is a transformer at least 160 VA with 2 secondary winding between 18 and 25 volts, The only thing close to that I can easily get a hold of is a toroid, Will this work? The one I am looking at is Jaycar Cat Number MT-2113 (18 Volts) or MT-2114 (25 Volts).

I think I understand a bit more now that I have read the LM3886 build guide and looked at pictures from chipamp, but I would still rather be sure.

-Dream
Title: Re: Who wants a power amp kit for free? **Out of LM3886 kits**
Post by: joecool85 on June 17, 2006, 07:52:20 AM
It's always a good idea to do research BEFORE building a project like this, so good job on that.  As far as a transformer goes, I recommend one of these:

Avel 25+25 250va toroidal http://www.partsexpress.com/pe/showdetl.cfm?&DID=7&Partnumber=122-625

For the fuse I just used a 1 1/4" glass tube fuse.  Not sure how many amps it was...I think 3 amp.
Title: Re: Who wants a power amp kit for free? **Out of LM3886 kits**
Post by: DreamSeller on June 17, 2006, 08:03:44 AM
Rather than shopping over the internet I would go Jaycar. They have 25V 160VA or 18V 300VA.

Would the 160VA work, I ask because its around $20 cheaper

-Dream
Title: Re: Who wants a power amp kit for free? **Out of LM3886 kits**
Post by: joecool85 on June 17, 2006, 09:36:55 AM
For a single LM3886 a 160va should be fine.  I got the larger one so I could add another channel if I wanted to.
Title: Re: Who wants a power amp kit for free? **Out of LM3886 kits**
Post by: DreamSeller on June 17, 2006, 10:18:44 AM
Cool thanks, And sorry dude I has no idead what the useless and informative things were so I just randomly clicked, I think I clicked useless. My bad.

Which tonestack would be good in this?

-Dream
Title: Re: Who wants a power amp kit for free? **Out of LM3886 kits**
Post by: joecool85 on June 17, 2006, 11:48:51 AM
No worries.

As far as tonestack goes, its up to you.  I'm using a marshal preamp box on mine.  RDV built one but I keep forgetting what it was lol.
Title: Re: Who wants a power amp kit for free? **Out of LM3886 kits**
Post by: Fixr1984 on June 17, 2006, 11:59:29 PM
I stand corrected.
The LM3886 will run on that transformer.
The 18v min is a [v+] + [v-] value which could even be 18vct.

RDV
So if that transformer will work,
How many watts are we talking here? How many volts would be ideal? How many volts to get full potential out of the chip?
Title: Re: Who wants a power amp kit for free? **Out of LM3886 kits**
Post by: RDV on June 18, 2006, 01:12:56 AM
To get full power you'll need either 36 to 50vct or a 18 to 25v dual secondary transformer with a VA rating of around 160. I little less or a lot more VA won't hurt. Just remember that any poweramp is only as good as it's power supply.

RDV
Title: Re: Who wants a power amp kit for free? **Out of LM3886 kits**
Post by: RDV on June 18, 2006, 01:15:03 AM
And to all:

Be careful with mains voltage!!
Title: Re: Who wants a power amp kit for free? **Out of LM3886 kits**
Post by: joecool85 on June 18, 2006, 07:32:43 AM
^^ I second that.

I do still have that transformer if anyone is interested.  But even though it would work ok for a LM3886 setup, it would be ideal for a LM1875.
Title: Re: Who wants a power amp kit for free? **Out of LM3886 kits**
Post by: BrianGT on June 21, 2006, 05:51:41 PM
I hope all of you enjoyed the free kits :)

I prefer the 2x25vac avel transformers, and use a 330va one for my stereo 3886 amp.

--
Brian
Title: Re: Who wants a power amp kit for free? **Out of LM3886 kits**
Post by: joecool85 on June 21, 2006, 06:15:17 PM
Just so everyone knows, BrianGT is the Brian from chipamp.com and he is the one who has supplied me with the LM3886 kits and LM1875 kits. 

A big thanks from all of us at SSGuitar!  Thanks Brian!
Title: Re: Who wants a power amp kit for free? **Out of LM3886 kits**
Post by: RDV on June 21, 2006, 06:43:59 PM
Yes indeed thanks to Brian!

I listen to my chipamp.com stereo every day. Now if I could just get those darned speakers right!  :duh

RDV
Title: Re: Who wants a power amp kit for free? **Out of LM3886 kits**
Post by: joecool85 on June 21, 2006, 07:34:25 PM
btw, do we have some people ready for some build reports?  Questions?  How are those LM3886 kits coming guys?
Title: Re: Who wants a power amp kit for free? **Out of LM3886 kits**
Post by: DreamSeller on June 21, 2006, 11:32:45 PM
Just got my kit, Thanks Joe and Thanks Brian.

Just wondering on these things

-Which do I build, Whats the difference between the standard confiuration and the feedback capacitor

-What rating and voltage should the on/off switch have and where does it goe i.e. before or after the transformer

-What kind of fuse, 2A 3AG or M205 or Ceramic Fuses.

Thanks

-Dream

One other thing, I want to use the flipster as the preamp and power it from a different transformer, What is the safest way to hook two transformers up to one ac power supply.

Also is this power supply regulated?
Title: Re: Who wants a power amp kit for free? **Out of LM3886 kits**
Post by: joecool85 on June 22, 2006, 07:47:15 AM
Let me try to answer most of these.

The I used the feedback cap on my LM3886 because if I remember right it is just a good idea and helps keep you away from SPiKe protection kicking in.  Someone correct me if I'm wrong on that.  Regardless I did it.

For the on/off switch you'll want a 110v or higher and 3 amp or higher

I think I used a 3amp 1.25" glass tube fuse but a 2amp would be plenty (2amps x 110v = 220w)

If you have more questions, its not a problem.  I asked the equivelent of a 400 page novel before I built mine lol.
Title: Re: Who wants a power amp kit for free? **Out of LM3886 kits**
Post by: RDV on June 22, 2006, 08:01:33 AM
Just got my kit, Thanks Joe and Thanks Brian.

Just wondering on these things

-Which do I build, Whats the difference between the standard confiuration and the feedback capacitor

---> I used it. I don't think it makes too much difference.

-What rating and voltage should the on/off switch have and where does it goe i.e. before or after the transformer

---> A standard AC rated(110/220v) on/off switch will do and you put it between the AC line(hot) and the transformer(s).

-What kind of fuse, 2A 3AG or M205 or Ceramic Fuses.

---> Slow-Blo 3A should do the trick.

Thanks

-Dream

One other thing, I want to use the flipster as the preamp and power it from a different transformer, What is the safest way to hook two transformers up to one ac power supply.

---> Parallel. It sounds like you better do some reading before you start.

Also is this power supply regulated?

---> NO.

Please be careful.

RDV
Title: Re: Who wants a power amp kit for free? **Out of LM3886 kits**
Post by: Bob N on June 22, 2006, 09:26:00 AM
Damn! I wish I would have found this board earlier. I'm working on a guitar amp using The ROG Eighteen, Thundercheif, JCM800, and DR Boogey using sequential switching and wanted to mate them to an LM3886 based amplifier in a combo type install. I've already got the DR Boogey and the JCM800 built, tested, and tweaked the best I can and working on the Thunderchief this coming weekend.... oh well.... Everything is designed... Just got to pony up the cash for the parts.....
Title: Re: Who wants a power amp kit for free? **Out of LM3886 kits**
Post by: joecool85 on June 22, 2006, 09:34:50 AM
Check out the LM1875 thread, it'll be $14 for a stereo LM1875 setup.  So 2x25w RMS.  You could bridge them or parallel them for 50w.
Title: Re: Who wants a power amp kit for free? **Out of LM3886 kits**
Post by: DreamSeller on June 22, 2006, 09:40:00 AM

Please be careful.

RDV

Thanks, Im not intending to hook it up until ive read over some things and triple checked everything.

-Dream
Title: Re: Who wants a power amp kit for free? **Out of LM3886 kits**
Post by: joecool85 on June 22, 2006, 09:42:40 AM
^ Good plan.
Title: Re: Who wants a power amp kit for free? **Out of LM3886 kits**
Post by: joecool85 on June 22, 2006, 10:01:50 AM
Stobiepole - in the mail.
Title: Re: Who wants a power amp kit for free? **Out of LM3886 kits**
Post by: joecool85 on June 24, 2006, 01:21:10 PM
Aharon - I recieved your money, the boards will be in the mail monday morning.
Title: Re: Who wants a power amp kit for free? **Out of LM3886 kits**
Post by: joecool85 on June 26, 2006, 09:03:57 AM
Aharon - The boards are in the mail.
Title: Re: Who wants a power amp kit for free? **Out of LM3886 kits**
Post by: Aharon on July 05, 2006, 07:14:34 PM
Got them today....thanks JOE !!!!!
Aharon
Title: Re: Who wants a power amp kit for free? **Out of LM3886 kits**
Post by: RDV on July 05, 2006, 07:46:32 PM
One things for sure guys, if you don't like the amp for guitar, it'll make a great all purpose power amp. I'm using them as stereo amps and guitar amps, and I'm working on one that will probably be used as a PA amp for single or duo-style gigs along with my rescued Mackie 1202VLZ.

The church my son plays in the band at gave us a burned out Peavey 2.6C which I'm putting two LM4780 chips(each wired in parallel) for a 100 watt per channel stereo amp. The heatsinks are already there as well as the on/off switches and circuit breaker. It'll be a cakewalk! I thought about fixing the amp already in it, but the circuit board had been on fire in two places! This thing will be sweet!

RDV
Title: Re: Who wants a power amp kit for free? **Out of LM3886 kits**
Post by: Lithium600 on June 25, 2010, 06:16:39 PM
Any chance I could get in on one of those free kits if there are any left? It would be an enormous help for me. I really appreciate it.
Thanks,
Steven
Title: Re: Who wants a power amp kit for free? **Out of LM3886 kits**
Post by: J M Fahey on June 25, 2010, 09:03:03 PM
Mmmmmmmmhhhh , let's see.
So you become a member *just* to see if you can get a free amplifier kit.
Interesting.
Maybe you didn't notice that the thread is dead cold since June 2006.
Title: Re: Who wants a power amp kit for free? **Out of LM3886 kits**
Post by: bry melvin on June 26, 2010, 01:37:21 PM
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=320545833659&ssPageName=STRK:MEWAX:IT

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=320447070251&ssPageName=STRK:MEWAX:IT

couple of links for boards  cheap

I've only used these with TDA2050 though... and I haven't had time to finish the project  (studio reference powered speakers) so I can't guarantee their quality
Title: Re: Who wants a power amp kit for free? **Out of LM3886 kits**
Post by: joecool85 on July 07, 2010, 07:11:54 PM
Any chance I could get in on one of those free kits if there are any left? It would be an enormous help for me. I really appreciate it.
Thanks,
Steven

Sorry, these kits are all long gone by now.  If you are interested in a kit, hang around and post often.  They go quickly, but I probably will do another give-away soon.
Title: Re: Who wants a power amp kit for free? **Out of LM3886 kits**
Post by: Brymus on July 21, 2010, 10:47:00 PM
WOW see what I miss when I'm gone  :'(
I still havent etched my boards for my 3886 yet, been perfecting a pre amp,building pedals ,ect,studying.
This would have been nice,oh well.
Last I heard the board was compramised and being used for phishing and stuff.
Well nice to see you still have it going Joe.

Hope to see some nice builds from these kits you gave away is there a thread for that ?
Title: Re: Who wants a power amp kit for free? **Out of LM3886 kits**
Post by: J M Fahey on July 22, 2010, 10:03:15 AM
Hi Brymus.
Didn't realize you had been away that long.
Quote
Maybe you didn't notice that the thread is dead cold since June 2006.
:o :o :o
Oh well.  xP