Spin FV1 clock noise and volume drop problems

[Tjstomp96]

Hi all,

I am seeing on scope and hearing significant clock noise from Spin FV1 + dev board, plus attenuated volume/signal compared to bypass.
I can hear that the effect loaded from the eeprom is present. Any pointers to what may be causing either of these issues,
Thx,
Tim

[nickbungus]

Hi Tim

I'd try the digital forum.  There's some really good,  helpful guys,  I'm sure will get you sorted.

[Ice-9]

post a proper schematic instead of the layout, the FV-1 can be a little picky with the type of 32kHz oscillator and use a 33p or 47p cap not a 15p as a 15p can sometimes cause a problem with the crystal as well.
But first post a schematic so we can take a look without having to trace the circuit out from the layout as a schematic makes it easier for people to read.

[Ice-9]

Also try checking you FV-1 solder joints and cleaning with some flux cleaner on the joints.

[Tjstomp96]

Thx  for the reply. Unfortunately i dont have the exact schematic as this design was posted to tagboardeffects forum however I believe it is the vero prototype to a PedalPcb.com FV1 Dev board pcb (which has USB CH314A added)  - i have also purchased this - that schematic attached.

I tried swapping out Xtal (DT-38) cap to 33pF and 47pf with no luck. Although the board and the FV1 seems to buzz out fine, power and gnd etc - I will redo and take your suggestion on solder flux cleaner.
Ps great to see your from the Toon ! - im originally from the area , though now am a long time expat in Baltimore, US.
Cheers,
Tim