I have finished building a headphone amplifier:
http://headwize.com/projects/showfile.php?file=szeke1_prj.htm
replacing r4 with an lm317 current source, as suggested in the project addendum
now, it has a good sound, but there's noise coming from the volume potentiometer: that is very low or nothing when it is full on or full off, but quite loud when the pot is about half
i tried to wire the case of the pot to ground, but it made it even worse... now I removed it, but it didn't change much
by the way, the noise is present on both channels at equal level
what should I do? i'm really thinking about removing it ...
i wired the first pin to ground, the middle goes to the amplifier circuit, and the last one is from the rca input
it's "reverse" wired, that is you turn the volume up counter-clockwise (but I don't think that's the problem)
any help?
thanks
Nicola
http://headwize.com/projects/showfile.php?file=szeke1_prj.htm
replacing r4 with an lm317 current source, as suggested in the project addendum
now, it has a good sound, but there's noise coming from the volume potentiometer: that is very low or nothing when it is full on or full off, but quite loud when the pot is about half
i tried to wire the case of the pot to ground, but it made it even worse... now I removed it, but it didn't change much
by the way, the noise is present on both channels at equal level
what should I do? i'm really thinking about removing it ...
i wired the first pin to ground, the middle goes to the amplifier circuit, and the last one is from the rca input
it's "reverse" wired, that is you turn the volume up counter-clockwise (but I don't think that's the problem)
any help?
thanks
Nicola