Big Muff on/off problem

[SpufuZ]

Hi!
I just finished a GGG Big Muff that sounds really nice but i have problems with a severe "pop" when i turn it on and off.

Heres the schematic:
http://www.generalguitargadgets.com/pdf/ggg_bmp_ram_sc.pdf?phpMyAdmin=78482479fd7e7fc3768044a841b3e85a

I have included C15 and R26, but still the "pop" remains.
What could i try more to get rid of my problem?

//david

[deadastronaut]

do a search, im sure your not alone on this!!!!!!...........

http://www.diystompboxes.com/smfforum/index.php?topic=84452.0

[SpufuZ]

Ofcourse ive searched already!
But i cant seem to find much regarding the BMP.

Instead of focusing on that, lets discuss it here in this thread!
I know there is a lot of people here who could have som input in this matter.

[SpufuZ]

I solved the problem, i added a pull down resistor after the volume-pot.
The BMP is now completely silent!!

[deadastronaut]

brilliant....

what size ?....just for others with a similar problem...

[SpufuZ]

I know that its recommended to use atleast a 1M resistor as pull down.
But i only found a 150k and it worked fine.

[zombiwoof]

Did you use the TB switch wiring scheme that grounds the board input in bypass?.  Often just using that wiring will help eliminate pops.

Al

[SpufuZ]

Did you use the TB switch wiring scheme that grounds the board input in bypass?.  Often just using that wiring will help eliminate pops.

Al

Yes, i wired it like this:
http://www.generalguitargadgets.com/pdf/ggg_bmp_wiring.pdf?phpMyAdmin=78482479fd7e7fc3768044a841b3e85a

It didn´t help.

This might be beacause of the Voodoo Lab GCX unit i use to switch it on and off with.
The 3PDT-switch is always "on" and totally ignored by the GCX, so a pulldown resistor after the volume-pot was necessary.

//David