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Hello:
I’ve built the Vibe (love the purple!) but only get a whine when engaged. I hear the whine rate and intensity change when knobs are turned, and pitch changes with Voice knob turned.The yellow LED that came with the LDRs that I got from GPCB does glow and pulse, as I suppose it should.
Does anyone have the voltage readings for the ICs that I can check against?
I have a probe, but not sure where to start. This is my first ever vibe pedal.
I do get bypass signal with no problems.
Thanks for help!
I think I found problem; let me know if this is true.
I had difficulty with 3pdt board; I think it’s upside down. However, I have “out” on pub to “out” on 3pdt board. Not sure if that is correct.
See photo. Thoughts?
Also, what are the 4 holes around the LDR/photocells for?
tx,
jeff
The 3PDT wiring board is backwards.
Wiring Diagram
You will need a new wiring board. I suggest carefully heating and removing the wires from the 3PDT board only, to avoid damaging the pads on the main board. Then, insert the wires into a new 3PDT board. Alternatively, you could use a new ribbon cable or wire, but ensure the pads are thoroughly cleaned out first. Be cautious when cleaning out the pads to avoid ruining them.
The four holes are for soldering a cap in place for those that feel they must have a cap.
Thank you for your help. Can’t do new wiring board, however; can’t get the switch off the board.
What type of cap?
I’ll figure it out.
tx,
jeff
I meant you would need a new switch and wiring board. If you want it like it was designed to be.
You could also wire to a bare new 3PDT switch and include the CLR using one of the standard DIY guitar pedal wiring methods.
A cap is simply any cover you choose to use for the LDRs. You can attach four leads to a cap (either by gluing or soldering) and then solder it to the board to keep it in place. However, this is completely unnecessary. They were added because they take up “zero space” for those who insist on using a cap for unknown reasons, even though the back lid of the enclosure will do the same job. The pads are not connected to anything in the circuit.
I apologize in advance for not knowing how to post this, but I just built the NT VIBE and it seems to work, but the yellow led is not pulsing? It’s a GREAT sounding preamp, but I was hoping for the Vibe vibe? I suspect the TL074 but who knows? Speaking of which? Does ANYONE know? I am open to suggestions. Thank you everyone!
@Todd
First since I cannot see. Did you use a non-conductive PCB spacer per the instructions between the metal circles of the Dual Gang pot and the PCB solder side containing 1n5817?
If that is not it I might suspect your TL074. It is easy enough to replace with a known working chip since it is socketed. The LED needs to be pulsing all the time, so that is easy enough to check as well.
Other things to try if that doesn’t work.
- Re-flow all of your solder joints on the back of the PCB.
- Take voltages and report for TL074, TL072, Q1, and Q2
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