LM1875 hum, strange problems.

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valtra103

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Joined 2012
Redshift187 said:
0.3V is not zero. It's actually really high for a source. Add that your 100uF capacitor to ground on your feedback is quite a high value (it affects low frequency less, which also makes it slower to respond to DC), it could be exactly as I said. If a capacitor before the pot fixes the problem, then try removing the capacitor after the pot.

What value is your pot?
Click to expand...

I will try that.
Yes 0.3v is high...
Pot for now is 100K, when get one i will put 10K. Because i copying LM4780 combination with 47K biasing resistor and 10K pot.
100uF feedback capacitor is made on porpose. Input cap -3db is if i remember correctly 1.5 Hz, so i had to make feedback even lower, it is 0.7Hz.
This gives amazing low frequency sound :D
 
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