Reasons op-amp has no output

[Elijah]

Hello guys. I'm having this trouble twice already. First I've built madbeans egodriver which is a clone of OCD. Then I've made myself a rat clone with some mods and the same issue keeps appearing. Audioprobing it I've found that the signal just doesn't come out of output pins of the op-amp. I also red that this could happen if the input pins were grounded or having exactly same voltage on them but none of this is my issue. Any help is wildly appreciated.

[garcho]

Wild appreciation?

Start with one project, take voltages, take pictures, post a link to the schematic, read the troubleshooting sticky, you gotta do a little homework to receive helpful help. There are many things you could have messed up, your description isn't enough to go on on its own.

[Bunkey]

Wild appreciation?

Start with one project, take voltages, take pictures, post a link to the schematic, read the troubleshooting sticky, you gotta do a little homework to receive helpful help. There are many things you could have messed up, your description isn't enough to go on on its own.

This forum is a friendly & helpful place. A lot of characters. A lot of knlowledge. A little intimidating at times.
I for one wildly appreciate the sentiment.

I do agree though that there are too many variables to make much more than a guess as to what the problem could be.

Check the pinout for the exact opamp you have using its datasheet, noting the orientation, as well as reading over any application notes on the datasheet and compare this with the circuit you're building - it might help with understanding the workings a little better if nothing else. If there are reference voltages needed for its operation, check you have all these configured properly.
There is no simple answer but it's likely that something just isn't matching up; being able to reset, come back to it and problem solve your work using the reference material available is a useful skill; just takes a bit of a methodical approach.

[antonis]

Audioprobing it I've found that the signal just doesn't come out of output pins of the op-amp. I also red that this could happen if the input pins were grounded or having exactly same voltage on them

For an ideal op-amp in an ideal world..

P.S.
Utilize all above well said..

[idy]

Usual trouble shooting includes measuring voltages:

is the opamp getting power on its power pins (4 and 8 on dual Opamps, 4 and 7 for single)?

Is the + input getting a bias voltage, usually half the supply (4.5v for stomp boxes)?

For me, no output on Opamp usually means a loose resistor or other error in that bias network.

[iainpunk]

you might already have, but i suggest you look at this link:debugging guide
we want pictures and voltages, that helps us help you!

cheers, Iain