Hello guys,
I have got a question about the op-amp circuit I have designed to amplify the output signal of my electeret mike, the supply is +-6V.
I have gor an starnge problem with this circuit, when The 30k gain pot is set at say 1k to 2k The output is very ok but weak as expected. but when I rise the said pot from more than 2K to any other value I hear a noise/distortion at the output. When I add another op-amp satge (inverting one I used) at the input of the below circuit then the said distortion/noise would be gone even if the gain of the added stage happens to be more than 10.
Can you guys please tell me whats the problem?
I myself am suspect to the C111, I say maybe it would not be charged/discharged very well when I incrase the 30k gain pot to more than 2k. I am not sure if I am right, but have no other idea whats the said problem?!
Thanks for any help
I have got a question about the op-amp circuit I have designed to amplify the output signal of my electeret mike, the supply is +-6V.
I have gor an starnge problem with this circuit, when The 30k gain pot is set at say 1k to 2k The output is very ok but weak as expected. but when I rise the said pot from more than 2K to any other value I hear a noise/distortion at the output. When I add another op-amp satge (inverting one I used) at the input of the below circuit then the said distortion/noise would be gone even if the gain of the added stage happens to be more than 10.
Can you guys please tell me whats the problem?
I myself am suspect to the C111, I say maybe it would not be charged/discharged very well when I incrase the 30k gain pot to more than 2k. I am not sure if I am right, but have no other idea whats the said problem?!
Thanks for any help