Yeah thats a bit odd, despite that check resistor values of R9, R10, R11 and last R12, R13.
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Show posts MenuQuote from: jubal81 on September 27, 2017, 02:24:46 PMthanx for the reply jubal81.
I'm suspicious it might be radio signal. Opamp inputs are very sensitive and those bias net traces become antennas, so it's important to keep the traces as absolutely short as possible.