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Well thanks for all the replies, but how can I find out how many ohm is my headphones.
A CMOY headphones amplifier uses op amps, not power amps to drive Sennheiser and AKG very expensive 600 ohms headphones that completely cover your ears for excellent bass.
The input capacitor creates a flat response down to 80Hz which is poor but 16Hz is at -3dB (half power).
The CMOY output is weak when it drives cheap 32 ohm earphones.
If you want bass boost and are using cheap 32 ohm earphones then you need a circuit designed for them.
I always thought they sounded ok and were cheap & easy. What would you suggest for a simple amp?
Hissss is audio from about 2khz to 20kHz. A tiny little 10pf capacitor does nothing at audio frequencies because it is a VHF radio filter (27MHz and higher).It did get me to look into Hissss. So here is a 386 circuit with anti Hissss (R1, C6) and base boost (C2, R5).
They are all used for ham radio that has no high audio frequencies so the hiss filter removes all high audio frequencies.If you have google google 386 hiss filter. There are several, several different values, but all above audio frequencies.
Hmm. Didn't mean to whine.
It did get me to look into Hissss. So here is a 386 circuit with anti Hissss (R1, C6) and base boost (C2, R5). R2 and R3 in the schematic represent a 10K pot with the wiper going to the amplifier. Hobbyguy, I think all the parts can be had at radio shack if you are in the US. For fun, get it working without C2 & R5 and R1 and C6. Listen to it then add each pair one at a time and share your impression of the performance change.
Hobbyguy, Are you still here or did you give up on us?