My circuit to get rid of LED popping

[Gilles C]

The first schematic is what I use every time I install a LED in an effect box. I added some delay to the second one, and some filtration to the third one.

I still have to prove that it works well because I don't remember the last time I had problems with LED switching noise. I would need to install such a circuit in a box that has LEDs causing problems to be sure.

http://www.gtechblues.com/Projects/BiColorLED_V2.pdf

As I said, I always use the first circuit in every box I build these days because I like to use Bi-Color LEDs. And I am using the 3rd circuit with all the parts added with my test box, just in case.

This one, which is the biggest of the 3 circuits.



But if you ever have problems with LED popping and want to try it, let me know if it works. If you don't have problems, or don't want to bother about an extra board, no problem.

Btw, as I mentioned in another thread, the project is pictured using the right set of contacts. But it may be better to use the center set of contacts for the LED to separate the IN and OUT contacts.

Thanks,

Gilles

[zjokka]

hey gilles,

older thread, but now i'm here.
prototyped my fat boostered without led and in the final build I get some popping when switching from bypass to effect on.
I imagined some easy fix  this thread kind of scares me as the fx is already boxed.

Isn't this circuit specifically for using two leds?

thanks
zj

[markm]

Try a bigger pulldown resistor maybe???

[zjokka]

sorry mark, but

do you mean the resistor dimming the led,
or the 1M on the board?

thanks
j

[markm]

Are you using the millenium bypass setup or a 3PDT footswitch?
Also, is this the layout from GGG?

[zjokka]

3pdt pcb layout from GGG marked JOAM

[Gilles C]

The circuit I posted is not the same as the Millenium  Bypass. It's only to get rid of the noise that could be generated by the switching LED switching.

The Millenium Bypass enables you to swith a LED with a DPDT, and at the same time won't generate any LED noise because of the use of the transistor, FET or Mosfet, while my circuit still needs a 3PDT to switch one or 2 LEDs on and off.

But if your circuit pops without even using a LED, you need pulldown resistors at the input and/or at the output. You need to disconnect the LED  if you are using one, and want to know if it is comng from the input/output or from the LED.

Gilles

[zjokka]

I applied this LED wiring suggested on Jack Orman's site and it works perfectly. No popping at all.
Old thread I know, but thanks still guys..  With my very basic electronics understanding I would have put bigger pull down resistors.

thanks
ZJ

[Pushtone]

I applied this LED wiring suggested on Jack Orman's site and it works perfectly. No popping at all.
Old thread I know, but thanks still guys..  With my very basic electronics understanding I would have put bigger pull down resistors.

thanks
ZJ

Would that be the version with the cap to slow the in-rush as show here?

http://www.muzique.com/lab/led.htm

Or without cap and R2

[John Lyons]

Thanks Giles for posting this. I missed this the first time around. I was having a switching pop (more of a thump) last night.

John

[zjokka]

I applied this LED wiring suggested on Jack Orman's site and it works perfectly. No popping at all.
Old thread I know, but thanks still guys..  With my very basic electronics understanding I would have put bigger pull down resistors.

thanks
ZJ

Would that be the version with the cap to slow the in-rush as show here?

http://www.muzique.com/lab/led.htm

Or without cap and R2

This is the exact configuration I used:



zj

I would post a gut shot but as I taped the solder points in order to avoid shorting out, there isn't much to see really

[zjokka]

Here's a pic anyway: 10uF polarized cap in black with black and green leads, in the front.
one resistor hidden by tape

[seedseed]

The muzique site with led popping does not work with high gain circuits especially fuzzes and overdrives.

[Gurner]

that'll be because it looks wrong.

The LED anode has 9V on it with the switch off, as soon as the switch is flicked on - current surge...there'll be poppage!

[Barcode80]

The muzique site with led popping does not work with high gain circuits especially fuzzes and overdrives.

wrong. used it on multiple high gains. there is a problem with the build if it doesn't work. leaky caps can cause uncurable pops, btw.