Class-a Headphones Amp

[kim707]

Hi I'm a newbie I have a Zen circuit and I'll use it as a Headphones amp,only problem is there is alot of hum
a friend told me it is a ps problem,what kind of ps filter
should I use and how much capacitance the circuit is biased
at 1A please help to fix hum

thanx

[kim707]

Hi Again
please help me

There is another problem I gave the circuit to a friend and he told me the amp frequency response is only about 10khz He said the volume control and the g-s capacitance of the fet form a low pass filter, now I dont know what else to do with it,the first problem I increased the capacitance of the ps but there is still hum

can you help with these two problems

kind regards

[Gordy]

kim707, is that a Pass type Zen circuit? If so ask a moderator to move this thread to the Pass section of the forum where you most likely will receive help.

[h_a]

Hi kim,

I get the feeling you already have a competent friend at hand, maybe he/she can help you a little more?

If adding caps don't help to get rid of your hum, then grounding is most likely your issue. Your friend has good tips for this as well, I'm sure

Have fun, Hannes