SOLVED Muroidea not getting any power - UPDATE

[Fuzz Wizard]

Hello, I am still very new to pedal building and bought the Muroidea kit from stompboxparts after my first build was a failure. I followed the general workflow tips thread and even managed to get the pedal working on my audiotorium test platform which was a really amazing feeling and it sounded awesome. Unfortunately, after I got it boxed up and did all the off board wiring, the pedal doesn’t work at all. I’m getting no bypass or even an led.

This whole endever has been very discouraging. I’ve spent a lot of money already on supplies and a workbench and everything, followed every step in the workflow thread, and still I have nothing to show for it. I really want to learn and master building pedals but I really need some help because I honestly have no idea what I’m doing wrong. Any help is appreciated!

 

[steviejr92]

You're using the wrong board for your foot switch

Update: this is the one you want

3PDT Latching Footswitch - Solder Lugs - PedalPCB.com

Footswitch

www.pedalpcb.com

 

[Fuzz Wizard]

You're using the wrong board for your foot switch

Update: this is the one you want

3PDT Latching Footswitch - Solder Lugs - PedalPCB.com

Footswitch

www.pedalpcb.com

LMAO DUDE YOU ARE THE MAN

 

[steviejr92]

LMAO DUDE YOU ARE THE MAN

Dont get discouraged dude and start getting used to troubleshooting its part of the fun!

 

[Fuzz Wizard]

Dont get discouraged dude and start getting used to troubleshooting its part of the fun!

Thanks I'll for sure have to get used to it! Any tips on salvaging the pedal?

 

[steviejr92]

Thanks I'll for sure have to get used to it! Any tips on salvaging the pedal?

I wouldn't salvage anything if the pedal works which it should because you tested it out of the box, id just get a new switch and wire it up to the board you currently have!

 

[Fuzz Wizard]

After finally getting everything wired up properly, the true bypass is working but there’s no sound when the power is on. The LED turns on but besides that, I’m getting no sound. Any tips on where to go from here? I really want to get this thing working for a gig next month

 

[cdwillis]

I would double check that your jacks aren't wired backwards. Put a patch cable into one then use a multimeter to check continuity. The sleeve of the cable should have continuity with the enclosure/ground.

 

[Coda]

Which Opamp are you using? Did it come with the kit?…

 

[cdwillis]

If you bought an lm308 chip on ebay it could be bogus. You can try an OP07 or TL071 if you have one handy.

 

[Fuzz Wizard]

Which Opamp are you using? Did it come with the kit?…

It’s the one that came with the kit, I believe it’s an OP07

I would double check that your jacks aren't wired backwards. Put a patch cable into one then use a multimeter to check continuity. The sleeve of the cable should have continuity with the enclosure/ground.

I will try this when I get home from work tomorrow, but I’m not sure what a patch cable is or how to use it. I apologize but I’m very new.

 

[cdwillis]

I meant a guitar cable. A patch cable is what we usually call short ones that go from pedal to pedal on a pedal board.

 

[Fuzz Wizard]

I would double check that your jacks aren't wired backwards. Put a patch cable into one then use a multimeter to check continuity. The sleeve of the cable should have continuity with the enclosure/ground.

I’m getting continuity from the cable to the enclosure. Any ideas on what to try next?

I meant a guitar cable. A patch cable is what we usually call short ones that go from pedal to pedal on a pedal board.

Thanks for the info!

 

[benny_profane]

Are you plugging your input and output cables correctly? Is the volume up? If it’s working on the auditorium, it sounds like it’s an offboard or interface issue.

 

[Fuzz Wizard]

Are you plugging your input and output cables correctly? Is the volume up? If it’s working on the auditorium, it sounds like it’s an offboard or interface issue.

Yes and yes unfortunately. Do you think it could be a power supply issue? I have another pedal that has the exact same problem as this one. True bypass works, but when power is on there’s no sound but the LED lights up.

 

[cdwillis]

I would test to make sure the IC is getting power. If you haven't done this before it's easy. Put your multimeter setting to 20v, hold your ground point onto the bare enclosure then touch your red/hot pointer onto each pin to see the voltage. I just opened mine up to get some test voltages:

Pin 1: 9.12v​

Pin 2: 4.59v​

Pin 3: 4.16v​

Pin 4: 0v​

Pin 5: 0v​

Pin 6: 4.6v​

Pin 7: 9.18v​

Pin 8: 9.12v​

The power supply is giving it 9.6v, so your numbers may be slightly different, but they should be close. If not you can figure out what portion of the circuit has an issue.

 

[Fuzz Wizard]

I would test to make sure the IC is getting power. If you haven't done this before it's easy. Put your multimeter setting to 20v, hold your ground point onto the bare enclosure then touch your red/hot pointer onto each pin to see the voltage. I just opened mine up to get some test voltages:

Pin 1: 9.12v​

Pin 2: 4.59v​

Pin 3: 4.16v​

Pin 4: 0v​

Pin 5: 0v​

Pin 6: 4.6v​

Pin 7: 9.18v​

Pin 8: 9.12v​

View attachment 34935

The power supply is giving it 9.6v, so your numbers may be slightly different, but they should be close. If not you can figure out what portion of the circuit has an issue.

Ok, so this yielded some strange results. I’m getting 9.27v in, but nothing on almost every pin of the IC I’m getting -0.01v. Why wouldn’t the IC be getting any power at all?

 

[benny_profane]

Where are you measuring the input voltage? It seems like you have a short or open circuit somewhere.

 

[fig]

Do you have the Filter pot insulated?

 

[Fuzz Wizard]

Where are you measuring the input voltage? It seems like you have a short or open circuit somewhere.

I’m measuring it from the “+” symbol on the board.

Do you have the Filter pot insulated?

All the pots have dust covers.