Recent content by PJS

We've all done it

If the circuit passes signal to the output in bypass, then the signal is getting to the footswitch. If the signal is not getting to the switch when not in bypass, then as others have suggested there must be some short that is only an issue when the switch is switched "on"

Assuming you are running off 9v you should be getting 0V on pin 11 and about 9V on pin 4 of both the op amps. You need to work out why you aren't

If the ones you designed are the ones I just printed then thank you very much. I printed some for dual gang pots and they are awesome.

I have a fair bit of experience with component lead ends piercing electrical tape easily. If that is all that is on your pots assume they are not insulated unless you have made it really really thick (like thick enough that even if the longest cut lead end went in as deep as it possibly could...

Looking at the 2 different switch wiring schemes I do not think this bypass board could do the buffered bypass method. The traces hard wired into the PCB are going to be different enough not to allow buffered bypass. I am not sure whether or not Pedal PCB sell one to do it. You could do up...

Yes, it looks like normal operation for them to be working whenever the power is applied. Obviously the the one inside the case doesn't matter too much. The one outside the case will give you a visual idea of the rate it is set to before you engage it - just to make sure it seems right and the...

I can't see a crystal (X1) installed. The FV-1 won't work without that. Also, you need to redo a significant amount of the soldering. It looks as if most of the legs of the voltage regulator are not soldered at all, which won't help with powering the chip. Probably not an issue with...

The clock and data signals between the processor and EEPROM will measure 3.3v - they are digital signals alternating between 3.3v and 0v. With a multimeter they read 3.3v. You will need an oscilloscope to determine more detail about these signals, but it sounds as if they are present. I have...

The -9V pin on the charge pump is not measuring -9V. That -9v connects directly to the power pins on the op amps, and you measured -9V on both of those (or close enough). That does suggest to me that the charge pump can deliver -9v, but doesn't always. I would definitely be looking at the...

I had a problem on a different FV-1 pedal once where it would work fine on the internal programs but not external. The pins on the FV-1 had continuity to the pins on the EEPROM according to the multimeter. When I retouched the solder on the FV-1 pins it suddenly worked. The high speeds of the...

If the rate LED is steady then the LFO is not running. Look around there to see for wrong components etc. Also check the voltages on the op ap that drives the LFO

Pin 1 and pin 2 of both ICs should be the same, and should be sitting at 4.5V. It should be biased at that voltage by the 1M resistor on pin3. Pin 3 is the correct voltage, so I wold be looking for an incorrect component value or a short around the feedback network (R30, C13/16/17, drive pot...

I know from experience that those TRACO modules can take a fair bit of abuse and survive, so there is a good chance it is fine. I have before tested them on a breadboard just by providing voltage in the specified range to the correct pins and measuring the output pins. For me at the time I got...

And the full successful answer seems to be: 2.2M resistor from input to ground on the DI circuit. C2 becomes 220nF film cap, R6 becomes 1M and there are now 100k resistors to ground on the outputs to ground - from the junction between the 10uF caps and 100 ohm resistors. No more switch noise.