drawbacks to using pull down resistors?

Started by Solidhex, January 19, 2008, 05:12:21 PM

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Solidhex

What negative sonic effects have you all noticed on having pull down resistors added to a circuit. I would imagine the changed impedance would make a pedal like a fuzz face or rangemaster sound a tiny bit cleaner. It seems to me the rangemaster builds I've made without pull downs seem "juicier" and more responsive, have a more dynamic feel. My imagination? What do you guys think?

--Brad

petemoore

  A path between signal path and ground will shunt [attenuate] all signal.
  Put a resistor there and this effect is reduced.
  A large resistor is used to provide a path to ground which [hopefully] doesn't degrade signal much, yet is small enough to discharge each of the  DC blocking caps [used for input/output] so they don't make a spike-surge of current to signal output when switch contacts connect them and they discharge, and make popping sound.
  So the pulldown resistors actually drain a teeny bit of 'juice' off the signal too, and shunt it to ground.
Convention creates following, following creates convention.

Sir H C

Put a large enough pull down at the front end of a really high gain circuit, and you will raise the noise.

bluesdevil

Maybe better to just wire the footswitch to ground effect input while in bypass mode and do away with the resistor?
http://www.generalguitargadgets.com/diagrams/switch_lo_3pdt_ig_dcjack.gif
"I like the box caps because when I'm done populating the board it looks like a little city....and I'm the Mayor!" - armdnrdy