Hi, Gurus,
This circuits is another company designed for MIC, then this MIC+/- links to my designed module.
Then weird thing happens, the MIC volume is not stable with strong noise.
Attachment is my audio circuits, please note in real there is a 604 ohms resistor between the left ends of C400 and C402.
I am afraid that the other company's A1 & A2 just pass 120R then linked to 10uF, which may cause A1 and A2 unstable.
So, I want to know, how to change my design with the least change to solve this problem?
Many thanks.
Best,
Tony Liu
- - - Updated - - -
Hi, @KlausST,
You mean "series a 10K resistor", is series a 10K resistor on the negative input of A1? I just want to confirm it.
Thanks.