Add verb troubleshooting

[Anonymous]

Hey guys,

I successfully built an add verb and wired it in series with a delay circuit (delay into reverb) and it was running fine. I then started experimenting feeding the output of the verb back into the input of the delay via a momentary switch and a 10k pot to make some noise. It was working fine but all of a sudden the wet reverb signal cut out. It seems the guitar signal is running fine through the delay and then when it hits the verb circuit there’s a large volume loss and no reverb (at all pot settings).

So, my question is: could feeding the signal back into the input damage the btdr-3h or the pots or any other parts of the circuit? Or does anyone have any idea of what could be wrong?

Also, does anyone know the voltage read outs for the add verb circuit?

Cheers 🙂

[Anonymous]

[Cybercow]

I would start by first checking and reporting all voltage supply point values. A schematic with the included mod board would also help us better help you.

[Anonymous]

This is the way it’s wired up. Im getting 9.8V going in and out of each pcb. There was 4.99V across pins 1 and 2 of the reverb brick and 4.6V across pins 4 and 8 of the add verb tl072. I actually noticed one of the op amp pins had come out when I was fiddling with it, so that explains the volume drop. Now that I’ve fixed that problem fixed, the delay signal is passing through the reverb circuit and coming out of the amp fine but theres no reverb being added to the signal at any of the reverb pot values.

[Anonymous]

also for reference, this is how I wired the feedback loop

[Author]

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