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Originally Posted by flat5
Hello soundmotor, well you have built a Cmoy amp so you are loyal to them.
That's cool. What turns me off is the need for dual supplies.
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I wouldn't go so far as to say I am loyal to them. The HP amp I built is a hybrid of several designs not just the CMOY. The advantage of dual supplies, is linearity of operation for the device being utilized. With the micro performance levels these things have, any advantage is worth exploiting.
However, I have not built a LM386 based HP amp either, so I cannot comment on its merit. Although it uses capacitor coupling on its output (I am not a fan of that as it adds parts & puts one more thing in the signal path) I am sure it sounds just fine. But, you can build a dual supply quite simply from (1) 9V battery too. Take a look at the power supply for the CMOY here:
CMOY
For the one I built, I used 2x 9V batteries with my grounded connection being at the point the "+" of battery #1 to "-" of battery #2. Not a great deal of added complexity. Also, I was weighing the LM386 design you posted to the CMOY relative to the parts count & solder connections each has. To me they look to be near identical in that regard meaning neither presents a clear advantage in terms of how long it takes to build. Lastly, like the CMOY in the link above, the LM386 design you posted needs 2x single op-amp devices. I wired mine up for a dual 8P op-amp & thus reduced the parts count further.
Bottom line, there is no absolute here, just people sharing ideas on what worked for them. I'd recommend one more site for those inclined to build audio deivices for themselves:
DIY Audio
soundmotor
Soldering Advice: Don't hold the hot end!
