Homemade AMP Parts List Problem

[aditya]

Originally Posted by nands7

Guys, i just got my audio preamp built using TDA7439,IICed by a microchip dspic30f2010 with a panasonic rotary encoder connected at i/p.This preamp works fine ,able to change the volume and tones.

My problem is ,i hear a ticking sound whenever i rotate the encoder ,i beleive its something to do with the I2C ground (AGND and DGND)signal breking into analog side.
I even isolated the power to both micro and audio dsp ,but no effect!

DOES all the I2C based audio dsp's give the same effect?
Anybody has similar noise problems?

Please help!

i have used the same audio tone control circuit with 89C51 processor but havent faced any problems .. i dont think its power related

i think its probably some delay in sending data to the processor or communication related issue, and hope u have kept your I2C lines pulled up

if u want to try i could share my firmware. for 7439