Pop in relay switching with SHO.

[elenore19]

Hey all.
I built a Zvex SHO for a friend. it popped really hard when he engaged it
Looked it up to be a common problem. I replaced the 3pdt with a relay bypass.
Now there's a pop every time he hits the switch. Any ideas? Here's a link to the video.
https://photos.app.goo.gl/QJLmojqUxuaKUArM6

He tried a different power supply, without other pedals hooked up, etc.

Thanks for any help!

-Elliot

[Marshall Arts]

Try a pull down resistor on the input, if you don't have one already. 1M or so...

[elenore19]

Okay I will.

[Marshall Arts]

Like this: http://www.muzique.com/news/pulldown-resistors/

[Marshall Arts]

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

How is the Relais controlled? Is there a microcontroller in the box?