Is this how you test a Tl072 Op Amplifier

[rdhj]

I redid a bunch of the joints in that area and it looks like I still have the same thing going on. I was still getting 6 V. Should I just replace the two chips and see what happens? Also is there anyway to add a video attachment to this posting? I would like to take a video and share what it is doing to see if that would help any

[Rob Strand]

I redid a bunch of the joints in that area and it looks like I still have the same thing going on. I was still getting 6 V. Should I just replace the two chips and see what happens?

To fix the 6V problem you only need to replace the TL072.  It's a quick way to short-cut a lot of testing and perhaps get an immediate result.

Maybe no need to replace the PT2399 yet but if you have to factor in shipping and we end-up having to replace it anyway then it's up to you.

Also is there anyway to add a video attachment to this posting?

Not that I'm aware of.  People tend to upload to youtube then link that.   I think someone uploaded a video to imgur but it didn't work for me.

[Rob Strand]

Oh, checkout Reply #16 of this thread by Kipper,

https://www.diystompboxes.com/smfforum/index.php?topic=111503.0

Good part values matches to the kit.

Kipper's schematic has a bug on the filters (the Kit PCB is OK):
- move C9 to where R13 & R14 join
- move C10 to where C9 was (where R12 and R13 join)
Similarly,
- move C11 to where R17 and R18 join
- move C12 to where C11 was (where R16 and R17 join)
- C12 value on PCB is 22n not 27n

[rdhj]

Here is an update on my never ending issues.

I got the new Op amp today and installed it and when the pedal is on everything seems fine minus some static noise which I guess is normal.  But now I have a different issue.  When I switch it to bypass mode, the signal is cutting out for some reason (bypass was totally fine before).  Then if I unplug the 9V power supply line, it is fine.  Seems like it is now using the circuit in bypass mode.

Does this tell you anything.  Took it apart and looked for broken or crossed wires but found no issues.

[Rob Strand]

Here is an update on my never ending issues.

I got the new Op amp today and installed it and when the pedal is on everything seems fine minus some static noise which I guess is normal.

Good news then.

But now I have a different issue.  When I switch it to bypass mode, the signal is cutting out for some reason (bypass was totally fine before).  Then if I unplug the 9V power supply line, it is fine.  Seems like it is now using the circuit in bypass mode.

Does this tell you anything.  Took it apart and looked for broken or crossed wires but found no issues.

Wiring, wire connection, or the switch are the likely cause.   Once your in bypass the circuit doesn't have a say in the matter.
You can check the switch contacts with your multimeter conductivity tester.  You might be better off connecting to the ends of the wires that go to the switch instead of the switch itself.  The switch could be damaged, due to say heat,  and pushing the meter leads down on the switch can fix the problem but only temporarily.    You could also poke down on the switch contacts with  small plastic handled screwdriver to see if the poking helps.

I think someone mention the LED wiring early in the thread.   That can short onto the signals and cause trouble.  Maybe it's happening at the switch contacts.