Fuzzdog Bee Juice overdrive problems

[lvckv]

Having a problem with this – basically no overdrive, very low power reading at the jacks, a squealing feedback soun when I touch the footswitch connection.


Here's the PDF for the build and the PDF for the OptoPuss daughterboard.

I followed the PDF with no substitution parts, no modifications etc.


LED works on/off. Everything is wired according to the PDF. No solder bridges, all diodes are aligned in the correct way.

Normal clean guitar sound when footswitch is off.
Quieter clean sound when footswitch is on. Two of the pots change volume but there's no overdrive.
When I touch the underside of the footswitch, there's a squealing sound, like guitar feedback, and the D2, D4 LEDS on the main board turn on.


I was about to start testing the ICs, diodes etc, but then I saw that that there's a low voltage reading on the power jack. It gets variable readings of 2-3V. Not sure why..

Can't see anything obviously wrong with the wiring here.. (I accidentally used a red wire for ground ad black for live between daughterboard and main board – those wires are all connected correctly)

[antonis]

very low power reading at the jacks,

If you refer on IN/OUT jacks, they should have NO power reading at all..

[lvckv]

Oh yeah I mean the power jack obviously lol

[antonis]

Obviously then start checking power supply - jack wiring - circuit shorts..

Voltage on supply male plug - voltage on power jack lugs with + or - disconnected - voltage on circuit +9V /GND with jack wiring connected..

P.S,
Is there any chance for protection diode reverse placement..?? 
Or, maybe, for +9V/GND wires PCB pads mixed..??

edit: try to "isolate" daughterboard..
Effect ON directly to amp..

[lvckv]

The 1N4007 diodes (D3, D4, D6) and daughterboard 1N4001 diode are all aligned according to pdf – negative stripes cathode side to square pad. Flat side of LEDs goes to square pad.

The wiring from daughter to main board is ground to ground, 9V to 9V, in to in, out to out etc.

There are 100% no solder bridges, touching wires etc that would short the circuit.

Voltage on supply male plug - voltage on power jack lugs with + or - disconnected - voltage on circuit +9V /GND with jack wiring connected..

Can you explain this bit a bit more please?

[antonis]

Voltage on supply male plug - voltage on power jack lugs with + or - disconnected - voltage on circuit +9V /GND with jack wiring connected..

Can you explain this bit a bit more please?

Check your unplugged power supply output voltage -> Check voltage on DC jack without effect connected -> Check voltage on PCB respective pads..
ALL measurements should be taken using SAME ground point (preferably power supply negative one..)

[lvckv]

Got back to this today and now using a different multimeter it reads 9V and the effect works perfectly

Very odd, but I won't complain   

Thanks for the help