GGG BMP Violet Rams Head.

[Devius]

I've finished my first personal vero layout of the bmpvrh today. Voltages are damn near spot on, worked excellent first time I fired it up. Very stoked about this!
There is the popping when effect engages and disengages however. The first cap and resistor after the input is 100pF and 1.5M. I understand the 1.5M resistor is a pull-down but I don't understand what the 100pF is doing. Can I eliminate the cap and bump the resistor up to say 2M to eliminate the pop?

[Bill Mountain]

I've finished my first personal vero layout of the bmpvrh today. Voltages are damn near spot on, worked excellent first time I fired it up. Very stoked about this!
There is the popping when effect engages and disengages however. The first cap and resistor after the input is 100pF and 1.5M. I understand the 1.5M resistor is a pull-down but I don't understand what the 100pF is doing. Can I eliminate the cap and bump the resistor up to say 2M to eliminate the pop?

That 100pf is cutting ultra high frequencies so you can keep it in.  Raising the pull-down resistor won't get rid of pop.

There are several reasons it pops.  The most common that has happened to me is that the output cap is leaking DC.  Are any of your pots scratchy when you turn them?

it could also be your LED causing a pop.  Are you using a super bright one?

[Jaicen_solo]

Is the pulldown resistor before or after the cap to ground?

Also, are you grounding the FX input in bypass?

EDIT: Looking at the schem, the 100pF cap on the input is on the wrong side of the 1M resistor. Probably because the original was not true bypass, so it wouldn't have made a difference. If you leave it like that, you've got to ensure that the input is grounded in bypass or it will pop. It is very small, but I guess with the amount of gain in a BMP it could be problematic.

[Devius]

The pots aren't scratchy. I'm using the beavis breakout box that I've built and it has a blue  bright led so I suppose I could increase the resistor to it and see if it eliminates the pop.