How to true bypass a DOD FX96 delay pedal

[liddokun]

I true bypassed a DOD FX96 delay pedal a while ago, and I keep getting PMs about people asking for directions on how to true bypass other DOD pedals.
So I will create this thread on how I did my delay pedal, which I hope will have some relation to your DOD pedal, but I can't guarantee the steps are the same.

Thanks to Thomeeque for the help on doing this.

"
    * Q3 works as an MUTE for delayed signal in BYPASS mode (by grounding RC pin of U2B) - just remove it, so it' not muted anymore
    * Q2 connects P4 to dry signal path in DELAY mode (makes P4 able to alter volume of dry signal going thru) - remove it and bridge PCB pads for it's drain and source pins (2 and 3), so the P4 is permanently connected
    * Q4 bypasses STATUS LED in BYPASS mode (LED does not shine, all current goes thru Q4) - remove it and use one switch of your 3PDT to do same the thing (one pole of switch will lead to Q4 collector's PCB pad, second to the Q4 emitor's PCB pad /or to the ground/ - switch must be ON in (TRUE)BYPASS mode, OFF in DELAY mode)

This way you will have circuit always in DELAY mode and LED ready to indicate state of the 3PDT switch, now you can wire usual true-bypass switching using remaining two switches of 3PDT switch."

Here is a picture to clarify:


Please don't go pulling transistors and FETs unless you know the correct ones in your DOD, these steps only work 100% for a DOD FX96, so make sure you know what you're doing with your ohter DOD pedals.

[jollygreengiant]

Thanks for sharing the info.

I found a few other threads over a couple of forums where guys had taken out the flip flop/fet switching. I'm going to have a look at these and see what the recurring cmos sections are and see if I can find out a unilateral way of taking them out. Looking at the Punkifier, buzzbox and gonkulator the bypass sections are all pretty much identical.

When I find it I'll post it up.

[sewage666]

I came across the link to this from another thread... awhile back I was looking into true-bypassing a DOD FX90 because the footswitch was terribly unreliable. After doing some research about what to jumper, remove, etc., I realized that it powers up with the effect on. I didn't have to jumper or remove any transistors. I think this is the case with quite a few DOD pedals?

I just added the footswitch, no serious circuit bending required. Anytime it gets power, the flip flop turns the effect on and the manual footswitch directs the signal.

If only BOSS did the same, there wouldn't be so many threads asking how to true bypass a BOSS pedal.