Weird hiss and buzz.
Oct 30, 2008 at 1:53 PM Thread Starter Post #1 of 5

TzeYang

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So I built a portable amp with push pull buffers, three channel and with OPA627 L/R and AD744 GND with comp pin output. Gain is 6, potentiometer is an alps RK097 WITHOUT the switch. (regular RK097)



Source PCM2702E (Neochen's miniusb)


Hiss and Buzz:

Appears:

1) When there is no music playing.
2) Appears at maximum volume when i touch the shaft.
3) Sometimes disappears when I remove the board from the metal case. Though I doubt the case is the issue because it occurs randomly at a low rate.


This is seriously bogging me, I've never had such problems with any other amplifiers I built before.

I even grounded the pot shaft with a wire directly to the TLE2426 tightened using the nut on the RK097 and it's still giving me buzz and hiss. Any ideas?
 
Oct 30, 2008 at 9:31 PM Post #3 of 5

tangent

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Do any of the op-amps get hot?
 

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