Jama211
Head-Fier
- Joined
- Aug 18, 2005
- Posts
- 52
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- 0
Recently I built a headphone amp very similar to the Cmoy amp. It was built correctly (I checked everything) but when i hook it up, the noise is horribly grainy especially in the bass. The thing is it asks for a 15V power, and the only thing i had was a 9V battery, so i tried it with that. firstly is the lowered power from 15V to 9V the cause of the grainyness? Then i tried to wire 2 9V batteries in series to make 18V and it doesn't work! the next thing i tried was wiring 4 1.5V batteries and a 9V to make exactly 15V. it didn't work. if i ever try to wire any battery sequence in series, it doesn't work. i then tried 2 9V batteries, but this time i wired them in parrallel. it worked, but it was still quite grainy especially in the bass, and it was still clipping, and it got worse the louder i made it.
(obviously)
Why won't it let me wire the batteries in series?????
Im afraid i can't post a schematic because i only have a printed version and I don't have a scanner for a day or two
then i will post one.
I am using very cheap portable efficient headphones (Very cheap for the moment in case they blow up)
(later I will use my grado's)
i tried a line out from a hi-fi cd player and i also tried line out from portable cd player and line out from tape rec out from amplifier.
I am using a volume knob, and it would get grainy at about half way (Which isn't very loud at all.)
Unfortunatly I don't know the gain settings for the amp. (Is there an easy way to check?)
The crappyness of the headphones is not the source of the grainyness by the way.
Can anyone help me?
(obviously)
Why won't it let me wire the batteries in series?????
Im afraid i can't post a schematic because i only have a printed version and I don't have a scanner for a day or two

I am using very cheap portable efficient headphones (Very cheap for the moment in case they blow up)
(later I will use my grado's)
i tried a line out from a hi-fi cd player and i also tried line out from portable cd player and line out from tape rec out from amplifier.
I am using a volume knob, and it would get grainy at about half way (Which isn't very loud at all.)
Unfortunatly I don't know the gain settings for the amp. (Is there an easy way to check?)
The crappyness of the headphones is not the source of the grainyness by the way.
Can anyone help me?