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04-25-2021, 04:56 AM
Hi Fellow TUT Followers,
Attached is a schematic showing the FX Loop I used in an amp that I built for a local pro. (The preamp shown is not in his amp, which has switchable Clean and Drive modes.)
He wanted a serial loop, for a Delay pedal, followed by a Reverb pedal (fitted inside the cab), instead of built in reverb and a panel knob to control the reverb level.
I achieved this with the attached circuit.
He recently asked if I could make a foot switchable bypass for the serial loop so he could mount his Delay pedal in the cab also and then just use the amp foot switch box, instead of adding the delay pedal out front. I was able to do this by repurposing one foot switch's function that he didn't use and changing that relay's wiring, as shown and adding a panel switch, as well.
Initially I had it wired so that the loop return was switched in and out, but that meant I lost the Delay Tails.
I rewired it to switch the send in and out, which retained the tails, but the Delay pedal output Z is loading down the bypass signal and there is a volume drop; it works great with no pedal, which is not the object of the exercise.
I would like to find a way to have the Tails and no signal loss in bypass, but I am struggling to find a solution.
If any of you can suggest a suitable way to fix this, I will be very grateful. Otherwise I will change back to loop return switching and he will have no Delay Tails when bypassing the loop.
Cheers, Noel
40C110 - FX Loop Bypass. 2302021.pdf (Size: 709.88 KB / Downloads: 8)
Attached is a schematic showing the FX Loop I used in an amp that I built for a local pro. (The preamp shown is not in his amp, which has switchable Clean and Drive modes.)
He wanted a serial loop, for a Delay pedal, followed by a Reverb pedal (fitted inside the cab), instead of built in reverb and a panel knob to control the reverb level.
I achieved this with the attached circuit.
He recently asked if I could make a foot switchable bypass for the serial loop so he could mount his Delay pedal in the cab also and then just use the amp foot switch box, instead of adding the delay pedal out front. I was able to do this by repurposing one foot switch's function that he didn't use and changing that relay's wiring, as shown and adding a panel switch, as well.
Initially I had it wired so that the loop return was switched in and out, but that meant I lost the Delay Tails.
I rewired it to switch the send in and out, which retained the tails, but the Delay pedal output Z is loading down the bypass signal and there is a volume drop; it works great with no pedal, which is not the object of the exercise.
I would like to find a way to have the Tails and no signal loss in bypass, but I am struggling to find a solution.
If any of you can suggest a suitable way to fix this, I will be very grateful. Otherwise I will change back to loop return switching and he will have no Delay Tails when bypassing the loop.
Cheers, Noel
40C110 - FX Loop Bypass. 2302021.pdf (Size: 709.88 KB / Downloads: 8)
