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Who wants a power amp kit for free? **Out of LM3886 kits**

Started by joecool85, May 23, 2006, 10:45:46 AM

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teemuk

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.

joecool85

Ah, good point.  I was shearly going by voltage ratings.  Regardless, it should be perfect for a single LM1875 application.
Life is what you make it.
Still rockin' the Dean Markley K-20X
thatraymond.com

RDV

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

RDV

#18
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.

joecool85

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.
Life is what you make it.
Still rockin' the Dean Markley K-20X
thatraymond.com

joecool85

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.
Life is what you make it.
Still rockin' the Dean Markley K-20X
thatraymond.com

joecool85

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**
Life is what you make it.
Still rockin' the Dean Markley K-20X
thatraymond.com

SECONDandBOWERY

I've got dibs on the next LM3886 after Javacody!

Rock'n'Roll,
--Andy

joecool85

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.
Life is what you make it.
Still rockin' the Dean Markley K-20X
thatraymond.com

RDV

Quote from: joecool85 on May 26, 2006, 07:26:29 AM
I think thats +/-18 not that it needs 18v per rail.
Those are one and the same.

RDV

SECONDandBOWERY

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

joecool85

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.
Life is what you make it.
Still rockin' the Dean Markley K-20X
thatraymond.com

RDV

I stand corrected.
The LM3886 will run on that transformer.
The 18v min is a [v+] + [v-] value which could even be 18vct.

RDV

joecool85

Life is what you make it.
Still rockin' the Dean Markley K-20X
thatraymond.com

javacody

Payment sent. I accidentally sent you $1.50, so I sent another payment for $3.50 after that. Doh!  ;)