Hi,
I've just finished building my Sum Mix Pan PCB+Panel kit and I have to praise de quality of the PCBs, which is one of the best I have encoutered !
The module works great, except for the left side of the second input channel. The left side is completely ineffective :
An audio input in the second channel is only mixed in the right side of the output, with the PAN POT or with the PAN CV input,
The left panning LED (LED8) of the second channel does not ligth up and does not respond to the panning POT, nor to the panning CV input.
The right side of the second channel is OK and the volume controls of the channel are also OK.
My guess is that an OPAMP is dead, but I could not track down which one.
Any help would be apreciated !
Christian.
Hi Stefan,
I´m hijacking the thread - thinking it fits quite well... I´ve finished building the pusherman kit of mix + pan (pre-soldered smd). Unfortunately there is a weird twist with L+R Sum - the signal-path is twisted. Pan R sends audio out L and viceversa. All leds would indicate correctly though. Find a video attached showing what I´m trying to explain.
Problem 2: CH2 is dead - no output while all LED light up. I reflowed all connections, also swapped OTA4 for another working IC - checked on U15, U18, U8, U9 as mentioned below.
I´m hoping this makes sense to you and you can advice what to do next
Cheers, Marc