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I’m trying to wrap up my muzzle build, but looking at the wiring diagram for the sidechain passthrough I’m really confuse. On the key input (left side of diagram) I see connections on switch tip and tip. On the passthrough I see only a connection to tip. What about sleeves ? Should there be...

We will need to be more precise. When you give just the value of a component, we don’t know which side you measured. That’s why I use specific point with colors so we know exactly what you read. Can you reply to my message with the color and your result ? Also when reporting a transistor...

Any luck on measuring your voltage ?

No problem, you got some good info here to start troubleshooting. Go slow, be methodical, make sure that you have your jack in, that the pedal is engaged, and that you take you time to properly document your voltage. Other member here can help you when you get back on it if I'm not around...

Added information for testing. With the 500K pot in the middle, you should read: Q2: C: -4.5 D: -0,7 E: -0.5 Q1: C: -0.7 D: -0.2 E: 0

BTW, you have to set your fuzz put to the mid point that's the 500K pot. This is a list of voltage you should get with the pot set about in the middle. It may vary, as long as we are close.... I may not be able to stay on longer, so you could use this chart to approximate your voltages...

If you get the right voltage, let's measure the next voltages: Green -8.7V Blue: -4.5V

Q2 is too high, I believe it should be at 4.5V. Check the following points: Green should be -9V Blue should be -8.7V

OK, so the 7.19 where were your probe ? Black on the boar and and red on the jack ?

Just so confirm red goes to tone pot... it should go to your middle lug of the input jack.\

One more thing, any voltage test you do you must plug in a cable in the input jack, that's what switch on the power to the board.

OK that help... did you test with you DMM the 2 points I suggested. we want to make sure you have the voltage right.

Also do you have a schematic you worked from ?

And if you put your probe on respective colors, do you read -9V or 9V ? Red probe to the pot and black probe to the board soldering point.

Ok before you change anything please confirm the following: Where does the red wire of the battery connector go ? Where does the black wire of the battery connector go ? If you put your red probe on the solder point of the red wire battery and your black probe on the solder point of the black...

Well standard 9V battery connectors would have positive on the red wire and negative on the black wire. I can't see a red wire going to the board form the battery, it look like it's going to a pot or to a jack... that would make me think he's sending positive to the ground rail and the ground...

I don't see any protection diode in there, but if you have one and my theory of reverse polarity is right, that would explain the 0V reading.

BTW, I'm looking at the pictures and it looks like you sent the red wire to the pot ? and black to the board. I would suspect that to be reverse polarity. You red should be the + and go to you board.. no ?

BTW I'm surprised that no one asked for the solder side of the perf board... Unless it's there and I missed it.

Well we can't be both wrong :D