Home Brew Power Amplifiers

[hotaudio40]

I've built a few power amplifiers in my time and am just about to build a "GAINCLONE" type power amp.

I'm going to be using the LM3886 power amplifier IC, as I believe it has the potential to be the best IC around for building a simple, yet powerful, and very accurate, smooth, warm, Power Amp.

I've got the boards built up, and have it all soldered together.

I based it on the Specs for the LM3886 IC which can be found here:
http://www.national.com/ds/LM/LM3886.pdf

It seems to be a most amazing piece of technology, and I'm betting the sound will be just as impressive as the specs and write-ups about it.

Soon I will power it up with a series of batteries I got from my electric bike.

Plus / Minus 36 Volts of pure battery power Power Amplifier.

I would power it up with my AC transformer, but it is +/- 45 Volts and that may be a bit too high for the IC.

I don't want to blow it up right at the start.

After the battery power up, I will power it with the full +/- 45 Volts!

I expect it will be amazing!

I will post once I fire it up.

[hotaudio40]

Here, I got a nice picture of the assembled PCB.

[telcotony]

Originally Posted by hotaudio40

Here, I got a nice picture of the assembled PCB.

nice, I can think of a few places this mod would fit well.

A great replacement for burned amp modules.

[telcotony]

you have built more than a few amps in your time.
Do you remember the Mosfet amp you helped me design and build?
Well, the amp worked flawlessly for 5+ years. Until the Bias went out!
My own fault for using cheap pots.. Should have put in fixed value resistors.
Well I smoked the mosfets on the right channel. I'll order new ones when I get a chance. Unless the amp (above) will do the trick.
I was running 50V+-.

[hotaudio40]

Oh the amp above is so smooth, it doesn't make any sense to make any other amplifier.

The only drawback is that this amp can only run off + / - 35 Volts.

Having pushed it to + / - 45 it blew up

And reversing the battery terminals smoked it too

Got to use some protective diodes in that baby

I run it off of two 12 Volt 12 Amp - Hour Lead Acid Rechargeable batteries and it is quite nice

[mclemons]

Hello,
Any chance that you will sell these little modules, or a complete working amplifier? Or is there another place where I could purchase them?

[hotaudio40]

Yes there is a very good chance I will have these made up.

Do you think you'd be interested and what would you be will to pay for just the assembled unit like what you see above in the pictures ???

[spookygonk]

Originally Posted by hotaudio40

Here, I got a nice picture of the assembled PCB.
(

Ye gods, that's tiny (unless that PCB is a foot across ).

[hotaudio40]

Yes it is small, but I"m going to go with a different chip now, two channels in one chip

It will even be smaller ... half the size, and even more power