solderdude
Grand Contributor
yes, jumper the diodes D1 and D5 is correct.
Some more questions:
No diodes on the negative board? (LED?)
How do I know if Q2 is still working and functioning? It was really hard to solder Q2 to the board, because it does not want to take any solder to make a solid solder joint.
What about R19 and R23 on the negative board? R19 & R23 are 680 Ohm on the positive board.
R17 and R21 are empty on the positive board and 2.2k Ohm on the negative board.
You left out the volume control on the negative board. What do I have to connect to accomplish the blue connections you drew in?
I somehow managed to fill right hole of R7 with solder. Is that a problem?
Measure DCV across pin4 and pin8 of U2 (must be 24V when the power switch is on)
Without a power switch or jumper there won't be a voltage here.