DOD True Bypass Mod

[Seven64]

So I have been doing a bunch of reading and tinkering, but I cannot find any consistent information.  I am in the process of rehousing a DOD FX50B and trying to get it to be a true bypass pedal.  I have read both that you just need to shunt the source to drain on both the JFETS in the switching circuit.  I have also read to remove the JFET on the dry side and jumper the JFET on the wet side.  My audio probe cant make it past pin 3 on UA1, which is the input from the jack essentially.  Can anyone shed some light on what I am doing wrong?

[Mark Hammer]

The always obligatory question: why do you NEED it to be true-bypass?

[Seven64]

its more of just a learning experience for myself than for 'tone'  .... But this is how far I have gotten in the re-housing so far.

I have switched it back to both jfets jumpered, and am now getting clean "bypassed" signal when the effect is engaged. Am I correct in thinking all I need to do now is fool the switching circuit to thinking is always on?

[R.G.]

The schem shows that the switching is used to either turn both JFETs on or off at the same time. A low at the junction of D5, D8 and the 1M resistor should turn them both off. This turns off the feed of the dry signal to the output buffer and stops "shorting out" the signal fed to the level and tone opamp. The effect should then be on all the time. Try just shorting (or a 1K resistor or such) this point to DC ground.

[Seven64]

The schem shows that the switching is used to either turn both JFETs on or off at the same time. A low at the junction of D5, D8 and the 1M resistor should turn them both off. This turns off the feed of the dry signal to the output buffer and stops "shorting out" the signal fed to the level and tone opamp. The effect should then be on all the time. Try just shorting (or a 1K resistor or such) this point to DC ground.

Thanks!  Before reading this I pulled both my jumpers for Q1 and Q2, and it seems to work that way also 🤷