Skeptical Buffers schematic

[red]

Hi there!
i've built 4 skeptical buffers, 3 of them work, the last one not, I've checked and it gets 17v on the tl072, I think it could be the problem, it also make a loud noise when I disconnect the output, I would need the schematic for trying to fixit


Have a great day!

 

[Brett]

it also make a loud noise when I disconnect the output

Hey there @red, I'm pretty sure you're going to hear a loud noise any time you disconnect the output cable of a pedal if that cable is connected to your amplifier and you haven't put the amplifier in standby.

It looks like this one hasn't had a schematic added yet, perhaps you could try just emailing @Robert to see if he might be kind enough to send it over?

 

[Brett]

i've built 4 skeptical buffers, 3 of them work, the last one not, I've checked and it gets 17v on the tl072, I think it could be the problem

Do you have any of the other 3 working builds handy? Can you check the voltages on those with your voltmeter to see if the voltages on the non-working build are similar?

 

[Sturdag Lagernathy]

Voltage is normal. It has a charge pump making a bi -polar power supply, +17vdc and -17vdc, If you measure from ground. Between pins 4 and 8 on the op amp should be ~34vdc.