Pull down resistor on BMP

[feddozz]

Hello,

I searched this but I could not find it specifically for this circuit, and I am not knoledgeable enough to work this out. I am building a BMP ram's head from tag board effects and it has no pull down resistor. I was wondering if a 1M resistor from circuit imput to ground would be beneficial, or at least no detrimental.

In general these circuits do not seem to have it. Is there a reason?

Thanks
V

UPDATE: I searched a bit more. The lack of pull dow resistor is certailnly true for the Kit Rae schematics. I found other schematics with the 1M pull down resistor on. So it should be ok, but a confirmation from the wise would not hurt. Thanks

[Elijah-Baley]

In the original schematic of the Big Muffs, indeed, there's no included a pulldown resistor. Maybe you don't need it.
Build the pedal, if you get a bump when you engage the pedal you could put a resistor (1M - 2M) under Q1 transistor, from the input strip to the ground strip.

[antonis]

IMHO, there isn't need for (extra)* pull down resistor in this circuit..

You can use a 3PDT switch (if you want an LED indicator) with IN grounded in bypass mode and input resistor(*) in the role of pull-down..
(I don't presume that the time between switch throws is enough to cause leakage to the input capacitor..)

[feddozz]

Thank you all for the advice.
>3PDT
I was plannign to use a millennium bypass 2. In this circuit, is R1 the limiting resistor for the LED?

[GibsonGM]

The image didn't come thru, Feddozz.   If you mean the resistor that's in series with the LED, yes that's what it is.

[feddozz]

Link fixed. here

[GibsonGM]

As I'm reading the actual schematic on Geofex, yes, that's a dropping resistor, and is required...do you want to change the value or something?

http://www.geofex.com/article_folders/millenium/millen.htm