« Last post by JPK on July 09, 2025, 03:49:11 PM »
The problem must be between U1, C8, C9, R5, R6, P1, J1a, J1b. There are no other components involved. Check the values, the solder joints, the min/max value of P1, swap U1 with another OPA2134.
« Last post by Lud on July 08, 2025, 11:42:09 AM »
First the unit has a slighty lower level than the original signal and it comes up close to the original when i engage the unit. When then i engage the HPF there is a small drop and when i turn the pot fully clockwise i go from around -11dbfs to -28dfs, a massive drop.
Edit: sorry i should have mesured it properly with my multimeter. I'll do it tomorow.
« Last post by Lud on July 08, 2025, 10:34:08 AM »
There is continuity between U1 pin 1 and pot1 middle back pin and the one below, and there is continuity between 0V and Pot1 middle front pin and the one below.
« Last post by JPK on July 08, 2025, 09:34:52 AM »
Check that there is continuity between pin 1 of U1 and the center pin of pot P1 furthest from the front panel. Check that there is continuity between 0V test pin and the center pin of pot P1 closest from the front panel.
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