Unable to get any wet sound from Spin FV-1. Any help appreciated.

[rixta2]

Hey team. I'm trying to get an FV-1 working on a breadboard, but am having some trouble. I am building from the Arachnid schematic (page 3 of this link https://docs.pedalpcb.com/project/Arachnid.pdf) and am unable to get any sound from the circuit when the wet knob is fully turned.

I breadboarded this a few weeks ago and had trouble getting any wet sound, after going through all the traces I couldnt find any errors, so I ripped it all up and started again from scratch.

I have tried several different 32.768 kHz crystals (2 from Tayda and 2 from Jaycar) and crystal capacitor values of 15pf and 30pf.

I initially had the circuit set up with the 24LC32A chip, but since getting no sound I have grounded T0, S0, S1 and S2 to try and get an internal effect to play.

The LED (pin 5) turns on when I power the circuit, but does not illuminate at all while playing the guitar. It also illuminates slightly when I power off the circuit.
Is there an LED trouble shooting guide or a list of expected pin voltages floating around?

After setting this circuit up a second time and having it not work I am starting to think that there may be an issue with my chip (ordered premounted from PedalPCB). I cleaned the pins with isopropyl alcohol with the hope that might make a difference.

Any assistance would be greatly appreciated, Im very much looking forward to having this circuit set up so I can start programming some effects.

Cheers, Ricki.

 

[music6000]

Good Pictures are worth a Thousand words, Front & Back of PCB, Jack Connections, Footswitch Wiring.

 

[EGRENIER]

Ok, it might not be related at all, but I’ll share anyway...

i had a similar problem on a build, with the LED,... mine would work fine without the LED and stop working with the LED in place... So easy test is to remove the LED and see if the wet signal kicks in... if it does your footswitch wiring may be at fault.

in my build, I had used a 3PDT breakout board and installed it upside down.

 

[rixta2]

Good Pictures are worth a Thousand words, Front & Back of PCB, Jack Connections, Footswitch Wiring.

These probably wont be much help, but this is the setup. I am following the schematic linked above, with the changes I also mentioned.

 

[phi1]

If you haven’t already, I recommend studying the fv-1 datasheet. The pin 5 led is there to warn when your signal is clipping, so in normal operation it shouldn’t light while playing, unless you put a big boost in front.

the datasheet should tell you the voltages to expect. For now I’d set the pots to max (then check for 3.3v on those fv-1 pins), if the reverb and chorus mix pot inputs happened to be 0v on that patch, then you wouldn’t have any wet.

Have you tried to audio probe the input and output pins of the fv-1 to see where you have or don’t have signal?