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Travis, Thanks for republishing this info. dave
Subject: Re: echoplex
questions Here's how the foot
controller works: "The
circuit for a switch connected to the Footpedal jack is very simple. It is just
a resistor and a momentary switch connected in series between the tip and
sleeve of the jack. Pressing the switch connects the tip and sleeve together
through the resistor. The Resistor values determine the function that the
Echoplex executes. These switches can be in parallel, although if you press
several at once you will get unpredictable results. (It is possible to press
other switches while holding down Overdub, however). If you look in the EFC-7
pedal you will see that it is just seven switch-resistor combinations, all in
parallel between the tip and sleeve of the panel mount jack. Simple. 1% metal
film resistors should be used, here are the appropriate values:
If you
want to make your own feedback
footpedal (or elbow pedal, or whatever), use a 20k ohm or greater pot. Linear
taper is probably better, but log works too. The value and taper will change
the feel of the pedal, so you may want to experiment a little. The feedback
level is controlled by the amount of resistance between the tip and sleeve.
Anything over 20k should be maximum feedback, anything down around 0 should be
no feedback. Connect the potentiometer's wiper to the tip, and the sleeve to
one end of the pot. (Make sure it's the end that lets the pedal operate in the
direction you want.) Simple!" On Mon, Nov 24, 2008 at 8:00 PM, David Gans <david@trufun.com> wrote: At 7:39 PM -0800 11/24/08, Travis Hartnett wrote: Yep, that's the unit. A lot of times some contact cleaner will
fix the problem before you need to actually replace the switch. Use a
multimeter to check that the resistance off each switch is reliably the desired
value. Is that based on the value of the adjacent resistor?
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