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LM3886 Schematics + PCB

Posted: Thu Aug 25, 2016 6:11 pm
by mkioiu
Hello!
Very small PCB based on Yorkville Amps.
This circuit diagram Yorkville use in 50w guitar and keyboard amp, active stidio monitor, active PA speakers, small powered mixer... Circuit is simple R5, C5 and D1 make turn on/off delay on mute pin. I made over 80 PCBs, and use PC procesor heatsink for cooling. Most of them work in 2-6 channel amplifier for caffe-bars. Work great over 2 years in all condition even sumer heat. I you are beginer in DIY, start with this amp.
Pout 68W RMS, THD 0,01%, Damping >400
PCB size 53x25mm
I use the LM3886 was bought from kynix semiconductor. There is the datasheet : http://www.kynix.com/uploadfiles/pdf967 ... 789714.pdf
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Re: LM3886 Schematics + PCB

Posted: Fri Aug 26, 2016 5:21 am
by Garth
Those "Overture"-series audio power amps, originally from National Semiconductor (which has unfortunately been taken over by TI) seemed to be really nice (although I can't say I've ever used one).

Apparently you have to be logged into that website to see those pictures. Can you copy them to your post?

I wouldn't worry about damping factor. I've seen people use huge cables and all that, not realizing that the 8Ω speakers themselves have at least a couple of ohms of DC resistance if not more, and the crossover will have some too. The voicecoils are wound with thin wire to keep the moving portion light.

Re: LM3886 Schematics + PCB

Posted: Fri Aug 26, 2016 12:39 pm
by mkioiu
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Sorry. I'm not very good at this. I will re-post the pictures.
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Re: LM3886 Schematics + PCB

Posted: Thu Sep 01, 2016 9:09 pm
by brad
Thanks very much for sharing the design mkioiu. Have you worked on many other amplifier designs in the past?