Author Topic: Are new IC's (TL/JRC/LM...) more prone to pop when switched on?  (Read 1740 times)

Gainmonger

Hello friends.
Something weird has been happening lately: All my IC based builds are loudly popping when switched on/off and it's something that doesn't happen with trans based builds.
I've checked/double checked and triple checked everything, it doesn't matter. Huge pop.
All the tricks have been implemented: pulldown resistors, grounded input, grounded input+output, resistors in series, verified coupling/decoupling caps (etc) with no results whatsoever. I even used high end 3pdt switches with the smoothest action available to minimize mechanical noises.
My latest build (an overdrive) is just perfect soundwise but the switching pop makes it simply unusable.
With a DMM, i've checked if any voltage was detected at the input or output when bypassed. nothing except a variable 0.15-0.32v surge appearing at the output when switched on (grounded input/output configuration).
I'm pretty baffled right now, not able to find the culprit of it or even reducing the inconvenience.
I've built numerous OD's, distortions and fuzzes the past years, trans or Ic based but my last 3 IC based projects are just demonically popping.
Does anyone have that kind of problem or even better, a solution?
Thanks
GM
Ekil Erif, Ekam Erif, Erif Erif, Di Maggio.

ElectricDruid

Re: Are new IC's (TL/JRC/LM...) more prone to pop when switched on?
« Reply #1 on: July 28, 2018, 07:16:28 PM »
To answer the question posed in the subject:

"Are new IC's (TL/JRC/LM...) more prone to pop when switched on?"

...No. ;)

(there's something else going on)

thermionix

  • Guest
Re: Are new IC's (TL/JRC/LM...) more prone to pop when switched on?
« Reply #2 on: July 28, 2018, 08:59:13 PM »
It sounds like you know enough to not switch the board power on and off with the bypass, so I'm fresh out of ideas.

samhay

Re: Are new IC's (TL/JRC/LM...) more prone to pop when switched on?
« Reply #3 on: August 04, 2018, 12:53:35 PM »
Maybe it's something else in your signal chain.
Maybe you have a leaky input or output cap on another effect, which hasn't been a problem previously. Or maybe your amp input is not a ground level....
Or gremlins.
I'm a refugee of the great dropbox purge of '17.
Project details (schematics, layouts, etc) are slowly being added here: http://samdump.wordpress.com

Gainmonger

Re: Are new IC's (TL/JRC/LM...) more prone to pop when switched on?
« Reply #4 on: August 04, 2018, 03:53:37 PM »
Maybe it's something else in your signal chain.
Maybe you have a leaky input or output cap on another effect, which hasn't been a problem previously. Or maybe your amp input is not a ground level....
Or gremlins.

I think Gremlins. Those pesky critters...
Ekil Erif, Ekam Erif, Erif Erif, Di Maggio.