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Messages - iTzALLgoOD

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Amplifier Discussion / Re: is this right?
« on: January 30, 2008, 04:38:08 PM »
115VAC, 60Hz primary = what it needs from the wall (mains) to go.


300-0-300 secondary = one tap will be +300VDC, another -300VDC, and the center is neutral.  600VDC across the entire secondary.

The voltage is still AC at this point.  If you measure across the 2 legs with a meter set to AC you'll measure 300V.

I used a 270 in a tube amp that I built.  Most SS amps use transformers with lower voltage and higher amperage.

Do you need to replace a transformer or are you just curious about the ratings?

Amplifier Discussion / Re: Anybody use an OPA541
« on: January 30, 2008, 04:28:38 PM »
I just read my original post and noticed I missed an 8.  I meant 3886.

Amplifier Discussion / Re: Anybody use an OPA541
« on: January 30, 2008, 02:59:02 PM »

I found the chip and the datasheet at Mouserbut that link should work.

Amplifier Discussion / Anybody use an OPA541
« on: January 29, 2008, 08:33:58 PM »
I was looking around for chips to use with a transformer I was recycling and came across the datasheet for the OPA541.  It seems pretty straight forward, almost like a big 386.

Amplifier Discussion / Re: Recycled trannies useful??
« on: December 06, 2007, 02:03:20 PM »
What about a voltage doubling circuit.  I should still have enough amperage. Or are those a bad idea for audio applications.  Either way I do have 2 of them.

Amplifier Discussion / Recycled trannies useful??
« on: December 05, 2007, 07:06:02 PM »
I got a hold of a couple of battery back-up (the ones for your computer) transformers.  I'm guessing that they are 12-14 volt and maybe 7-10 amp.  Would this be something that I could use for a chipamp?  I am only a little bit familiar with power supply's.  Is it possible to build a suitable power supply with a simple but beefy transformer?  Thanks for any info.  John

Schematics and Layouts / Re: Complete project??
« on: October 28, 2007, 02:09:24 PM »
Thats to bad  :'(  I think its an easy way to get the attention of people that think it might be to hard to do on their own.  If I was compentent with this stuff I would help.  Maybe someday.

Schematics and Layouts / Complete project??
« on: October 27, 2007, 01:34:04 PM »
How about a complete project?  Schematics, layouts, suggested mods and parts list,  all the info for a novice to build there own SS guitar amp with relative ease.  I built a tube amp from and it was very easy to get good results with some basic skills and a little help.

Here's a link to the P1-Extreme over at AX84

The Newcomer's Forum / Re: Can we imitate marshall??
« on: May 07, 2007, 10:29:49 PM »
Try  If you look at the CORE AMP section you'll find 3-4 good tube preamps to suit different needs.  All have good documentation and most have layouts

The Newcomer's Forum / Re: Looking for a first amp
« on: May 07, 2007, 10:24:41 PM »
I just built my second Little Gem last week.  I built the first one in an hour and a little under 40 minutes for the second one.  For less than $10 (minus the speaker) you cant go wrong with these things.

Amplifier Discussion / Old wurlitzer transistors A7607
« on: April 25, 2007, 07:33:06 PM »
  I was going through an old organ someone had donated to me and found 4 ?transistors? marked A7607 / EP1844A.  I tried a search which usually works and came up fairly blank.  Anyone here know where I can at least cross-referance these things to see if they're  worth making a project with them? 
  They are attached to some small heatsinks and there's a transformer in the chassis make me wonder about the power output af them.

Preamps and Effects / Re: 2 footswitchable channels
« on: April 16, 2007, 09:30:53 PM »
Thanks for the info.  I sent an e-mail today.

Preamps and Effects / Re: 2 footswitchable channels
« on: April 16, 2007, 09:11:14 AM »
I'm still very new to all of this electronics stuff so I'm probably not the best candidate for testing anything.  I feel good if nothing smokes on the first power up. :D

Preamps and Effects / Re: 2 footswitchable channels
« on: April 15, 2007, 04:54:06 PM »
So many options ans so little money

Preamps and Effects / Re: 2 footswitchable channels
« on: April 15, 2007, 04:27:40 PM »
I have already built a Little Gem as well.  There's a post about using those for preamps.  So I could build 2 of those circuits and put one of my favorite OD or distortions in front of one of them?

It always sounds easy doesn't it. :)

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