MXR Distortion + reissue no power;

[antonis]

What should the voltages be on the IC pins?

On pin 6 & 2 about 4.5V.. On pin 3 a bit lower or much lower (dependent on your DMM particular impedance)

[bartimaeus]

check the datasheet, and you'll see that pin 7 should be power and pin 4 should be ground

https://www.ti.com/lit/ds/symlink/lm741.pdf?ts=1673717440091&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FLM741

pin 7 is the first thing i'd check: is the IC even receiving power? if the LED won't turn on, i'm guessing not

[Dormammu]

I replaced the R9 with 10ohm. I had figured R8 was 4.7k so I used that. Nothing. What should the voltages be on the IC pins?

Have you installed a DPDT or are you supplying signal and power directly to the IC ?

[GibsonGM]

I'm sure I'm not telling anything new when I say that the input jack has to have something inserted into it for power to switch on to the IC etc...since it's used to switch the ground connection...

[beedoola]

MXR replied to my email and gave me the values; R8 is 10ohm and R9 3.9k.

I got it working but it will die and not produce sound. Pin 7 gets 9v. Some of the other pins were lower than 4.5v. I'll check again later. Maybe the IC is compromised.

I ditched the DPDT and just hardwired the circuit to On.