Adding extra footswitch jack to my BMP?

[fluoreszenz]

Hi there,

i'm just building a Big Muff Pi.
Up to now it is down to the basics:

- input jack
- output jack
- 9 volts power supply
it also has the millenium bypass, and an DPDT footswitch.


Now, i also have a footswitch pedal (On/Off) left, which i would prefer to have on stage.

Then i could store the Big Muff behind in the rack and use the footswitch to turn the Big Muff On and Off. 


Is there an easy way to add a new jack to the Big Muff to make it switchable from a distance?   

Its standard function, turning the pedal On/Off with the DPDT switch, if the separate footswitch is not connected to the Big Muff, should remain.



Any infos on how to make the Big Muff switchable with an extra footswitch is highly appreciated.

[GibsonGM]

You'd have to run your input and output wires to ANOTHER switch on the BMP to choose between external jack switching or the DPDT on the box....then use a DPDT relay to switch, which would be activated by the 2-wire run going to an external switch.  Any 2 pole jack would do.  The jack and relay have to go into the BMP and also require power, so the idea (while pretty neat) isn't really that practical!

You can't send the signal out to the floor switch, B/C it would pick up all kinds of noise and hiss, so you need to do the relay thing.  Your external control wiring would be switching the relay on/off while the effect board is always on (just as it is in a normal build).
Look into relays if you are really thinking of doing this...seems like way too much of a hassle to me, though! lol

[Mark Hammer]

This old scan shows and explains how DOD does it.  The momentary switch used CAN be the one in the pedal itself, but there is absolutely nothing that prevents you from having a second paralleled momentary switch at a (reasonable) distance.  After all, they are both momentary, so you wouldn't have to be concerned about the current position of switch A negating the effect of switch B.

The diagram shows the use of J113s for switching and gives the rationale for preferring them.  Note that a variety of other FETs are also suitable and regularly used by Boss and others without problem.  The diagram shows what essentially amounts to an A/B switch, by turning one FET on when the other is turned off.  To make it a bypass, you would want to have 2 FETs turned on when the 3rd is turned off.  The side with the 2 FETs switched on at the same time is your "effect" side, and the opposite side is your "bypass" side.

Note as well that if you have commercial pedals which use momentary switches and FETs or perhaps CMOS switch chips for bypassing, there is really nothing other than space preventing you from popping in a small hole on the side of the chassis somewhere, and installing a mini phone jack for plugging in remote footswitches.  The side-jack gives you the chice of using the foot-treadle directly, or plugging in some sort of remote footswitch or even a row of switches for multiple pedals. 

The switching circuit inside doesn't particularly care if the momentary connection to ground is made at the pedal, or 20 feet away from the pedal.  I imagine that there is a distance at which the capacitance and linear resistance of the "extension cord" can impair functioning of the flip-flop circuit, but most of us here would not play venues that might require such distances.  And if we did, we'd likely be able to afford to pay Bob Bradshaw to work out those kinks for us.