Pulldown Resistors for my DIY A/B Switcher - Jemsite
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post #1 of 1 (permalink) Old 08-23-2012, 11:07 AM Thread Starter
 
Join Date: May 2008
Location: Philippines
Posts: 197
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Unhappy Pulldown Resistors for my DIY A/B Switcher

Hey guys, I have just recently gotten into building some pretty simple DIY stomps, namely, a Jack Orman design MOSFET Boost (http://www.muzique.com/schem/mosfet.htm) and a passive A/B line switcher. My current problem/issue concerns the A/B box.

My current pedalboard is set up like this:

guitar->A/B switcher-> [line A: Compressor->Chorus] [line B: Overdrive->Distortion] ->Delay->Boost->amp

At every given live playing situation, at least one pedal from either side of the switcher is kept on.

I have read on a DIY forum somewhere that in order to get rid of the popping sound I get from switching between the two signal loop chains, I have to solder 1Mohm pulldown resistors to ground on the respective loops' returns, and so I did. It did significantly reduce the popping, but not completely eliminate it. If left "bypassed" for too long one side will always manage to "charge up" and give a softer, but still bothering popping sound when I switch it in.

Should I reduce the resistor value to something like 500Kohms? Will this affect the signal integrity of my setup, considering that the parts of the A/B switcher circuit that have pulldown resistors always see an effected signal? Is there a better way to solve this popping issue? Please help a brother out!
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a/b switcher , diy , pedal , pop , pulldown resistor

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