Class A Power Amplifier by IRF530N+78L05
Posted by News
This is the best design I have came up so far!
I use two 6×6x4cm heatsinks per channel. Power supply is unregulated (just transformer, diode bridge and capacitors) but I cannot hear anything even when I put my ear within few centimeters of the loudspeaker. Opamp has very good power supply rejection ratio. I’ve tried to keep everything as simple as possible and basically LM317 would be just one extra opamp… If you are looking for better sound, get separate regulated low power supply just for the U1 opamp, something like +-15V at 100-200 mA.
I have also used one LM7805 to get bias for both channels - you may want to use two separate 7805 in a final amp to get better channel separation. R2 pot is anything from 500 to 50k. I have used 22k.
Read More Source:
http://www.geocities.com/leobodnar/audio_amplifiers.html
Thank you.
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By: flabdablet
Posted by flabdablet
Wire the front panel pots before starting any soldering on the PCB. It's easier to redo wonky first-try solder joints on big things like pots than it is on little things like PCB joints.
Once you get to the PCB, solder in the resistors first, then the capacitors, then the transistors, then the IC. This is pretty much the hardest-to-fry to easiest-to-fry order.
Pay special attention to getting the orientation right, on component where that matters (electrolytic capacitors, diodes, transistors and the IC).
And we do demand audio samples. Tags: capacitors, diode, transistor