Which 56K resistors are you referencing as 32K. There are a lot of 56K resistors in this circuit. If taking resistance measurements in a circuit, there may be parallel paths that are not readily apparent, this will cause the resistors to read lower than their marked value. So the readings you are getting may be normal. You have to look at the schematic to see if you have a parallel path and take that into account.Hi guys, The Mantle Fuzz was my second pedal build and I'm having a couple issues and need some guidance. It is woking but it doesn't seem to be loud enough, and the actual effect seems odd (wish I could describe it better). Anyway, i've checked all the components to ensure they're the correct values and have checked for any simple mistakes (wiring incorrectly, solder bridges, etc...) and everything seems fine.
1. I checked all components and my 56K resistors are mostly registering around 32K on my multimeter. is that an issue?
2. I have checked the voltages and have my calculated numbers in the photo. the majority seem to be spot on, or very close. several seem to be way off from the ones GiveUsYourBones has listed. I am not sure why they are so far off and how to correct the issue?
Thank you in advance!
The CD4013 is a Flip Flop, the voltages on this will seem weird until you look at them and the schematic and the pin out of the chip. Pins 4, 6, 8, and 10 are grounded and should be 0V, which they are. 12 is connected to 9, they should be the same, they are. 2 is connected to 5, they should be the same, they are. 13 is connected to 3, they should be the same, they are. Pin 14 is Vcc, good and pin 7 is ground also good. The Flip Flop will change states when CL2 (Pin 11) goes from low to high, this will depend on the signal from the guitar. The strange voltage I see is on the transistor on the top right. You have .05, it should be higher. Look at the other transistors.Thanks. I am not experienced enough to reliably follow a schematic to check for parallel paths, but I will give it a shot. I have used a red dot to indicate the resistors that are registering around 32k on this screenshot. That would make sense the reason why some are registering a different value. I checked each component with my multi before installing on the board and everything registered correctly.
Any thoughts on the differing voltage readings? specifically the pins on CD4013 seem to be vastly different.
This is such a great idea having an image of the PCB with all the V values. Would save a ton of time trouble shooting and forum diving, but would also take a lot of work to put together.In case anyone needs them, here are the voltages from a working mantle fuzz pcb.
OK check resistance between these points, should be close to 0 ohms. Electrically they are the same point so they should have same voltage. When the transistor conducts, the voltage goes low but should be greater than .6V, when the transistor is not conducting it will go high up to +9V.just checked and im registering 0 resistance between pin 11 on CD4013 and pin 3 on the transistor.