Che_Guitarra
Well-known member
I must have some kind of schematic dyslexia - it seems every project I build is guaranteed to need troubleshooting. The latest is a Vox wah project - modded off a Moutoulos PCB, true bypass, with variable R7 and C2 installed to nudge the wah's Q shape around.
Here's the board - i've superimposed back over the front to illustrate where the traces go:
And here's the circuit i'm going off - true to the Moutoulos PCB i'm using:
And here's the pedal in question:
The true bypass works, but when engaging the pedal i'm only getting a trickle of signal to pass. Flicking around the C2 rotary switch seems to do nothing, although toying with the pot-adjustable R7 does shape the note of oscillation. Transistors are Motorola 2N2222A's which were suggested by other pedal builders to be the best option for this gig - not MPSA18's as listed in the schematic.
If you can see any points of concern i'd be most appreciative if you can point them out. I just can't see where i've gone wrong.
Here's the board - i've superimposed back over the front to illustrate where the traces go:
And here's the circuit i'm going off - true to the Moutoulos PCB i'm using:
And here's the pedal in question:
The true bypass works, but when engaging the pedal i'm only getting a trickle of signal to pass. Flicking around the C2 rotary switch seems to do nothing, although toying with the pot-adjustable R7 does shape the note of oscillation. Transistors are Motorola 2N2222A's which were suggested by other pedal builders to be the best option for this gig - not MPSA18's as listed in the schematic.
If you can see any points of concern i'd be most appreciative if you can point them out. I just can't see where i've gone wrong.
