Dying LED no sound

[Dali]

I'm confused.

I just built my first pedal of the year, a Kaleidoscope and it worked perfectly unboxed for the 5 minutes I tried it. I boxed it after diner and saw that my blue 3mm LED was a bit pale. I set the pedal to OFF and plug the guitar. Bypassed I hear the guitar but when engaged/ON, there's no sound at all and the LED doesn't lit anymore at all.

What could be wrong?

 

[Robert]

Something made contact somewhere it shouldn't.

Got a DMM?

Measure the DC voltage across the two lugs of the DC jack, then check the voltage on Pin 8 (to ground) of either of the TL072's.

 

[Dali]

I have a multimeter but I still don't know how to use it.

I unboxed it and works again.

I think I found the culprit, it's a B10K that has no plastic cover like most Tayda ones. It probably was touching the board where the arrow is pointing:

 

[Robert]

That'll do it. Outside of the box the metal case of the pot is floating so it doesn't cause a problem... Once you install it in the enclosure it's a dead short to ground.

Take one off one of the other pots, they're removable.

 

[Chuck D. Bones]

Jovi recommends spacing the pots up off the board, see the Basic Workflow Tips. Make sure the leads are trimmed short on the solder side. You didn't actually use a dual pot like the picture shows, right?

 

[Dali]

You didn't actually use a dual pot like the picture shows, right?

I did but cut the "closer to the pot" pins first.

I bought 5 of them by accident on my last Tayda order. Yeah, I suck.

 

[Robert]

Ahh yeah, I remember you mentioning the dual pot mishap now....

Dust caps won't fit on those, when I use them I stick an adhesive rubber pad on the back to keep the PCB spaced far enough.

Self Adhesive Rubber Feet (Clear) - PedalPCB.com

Self Adhesive Rubber Feet

www.pedalpcb.com

 

[phi1]

I use this double sided foam tape for many situations like this.

 

[Dali]

I use this double sided foam tape for many situations like this.

What? It happens often?

Thanks for the tip. I feel less alone now.

 

[phi1]

Haven’t had this situation exactly, but I use this tape often when I’m trying to fit mods in like this.

 

[Chuck D. Bones]

I did but cut the "closer to the pot" pins first.

I bought 5 of them by accident on my last Tayda order. Yeah, I suck.

I've put dust caps on dual pots. Takes a little trimming of the cap to fit around the leads, but it works.

 

[Mourguitars]

Dust Cover for 16mm Alpha Pots

Guitar pedals, pedal parts and electronics.

smallbear-electronics.mybigcommerce.com

I bought 30 of these because Mouser and BLMS pots dont ship with dust covers...with my very first build i had a A5 that wasn't PCB mount that was shorting out the board was free floating banging and rattling around...duh !

They will fit just a little Trim for those duel leg pots, just like Chuck said

Mike

https://imgur.com/uyzlPZI