Pedal building

[bobbass4k]

Hey, i've got an old russian muff thats dead, so i decided to build a feedback loop in the enclosure. Anywho, i found [url="http://experimentalistsanonymous.com/board/viewtopic.php?t=134"]this[/url] which is pretty helpful, but when ordering stuff, i found footswitches are pretty expensive (i'm trying to build it for<£10) and it occured it to me that i don't actually want a true bypass box, and i wouldn't use it, and i'd only use the feedback loop pedal when kneeling down to make noise with my pedals so i don't mind activating it by toggle switch.

Anywho, how would i wire it up so that it's just the in and out jacks, and a pedal hooked up to the send return jacks, and the pedal works as normal when the feedback toggle is off, and feedbacks when it's on?

(so much for physics students being problem solvers........)

cheers

Edited February 1, 2009 by bobbass4k

[Al Heeley]

I reckon this should do it using only a spdt switch.
In 'bypass' mode the signal goes direct from input to send and direct from return to output jack.
When loop is switched on, the return signal can be fed back into the send jack via the pot. hence this gives you the loop with no need for the true bypass switch - after all, the effects boxes themselves have an off switch you can use if you don't want the sound in the loop.

[bobbass4k]

[quote name='Al Heeley' post='397366' date='Feb 1 2009, 10:54 PM']I reckon this should do it using only a spdt switch.
In 'bypass' mode the signal goes direct from input to send and direct from return to output jack.
When loop is switched on, the return signal can be fed back into the send jack via the pot. hence this gives you the loop with no need for the true bypass switch - after all, the effects boxes themselves have an off switch you can use if you don't want the sound in the loop.
[/quote]

Cheers, that's just what i was after, i've already got the stuff, i'll give it a go now. Nothing like a little late night soldering.

[Al Heeley]

Heh, hope its better than my late night drawing....

[Al Heeley]

Thanks for posting this idea, I gave it a try with a slightly modded wiring, and hooked it up to my Bass Chorus.

Loop/bypass is chosen on the 3PDT footswitch, feedback is selected with the mini DPDT toggle switch.
Each has it's own indicator LED.
It works really well, it is true bypass and silent switching. the battery is only there for the LED's so it will still work fine unpowered.
I used a 470K pot I had lying around but you don't really get to hear the feedback until over half way, so probably a 250k pot would be fine.
Here's the schematic I sketched for it.

In use, it really thickens and deepens the chorus effect, sounds really spacey, like a chorus and a bit of flange superimposed over one another, which is hardly surprising I suppose since its feeding part of the chorus output back into its input. Don't turn above 9 or you get a horrible squeal.
Yet to try it on other stompboxes, maybe looping and feedbacking a Tubescreamer would be wicked

[bobbass4k]

Finally got round to building it, it works pretty well, doesn't seem to like my chorus though, at really low feedback the signal just gets buried under a weird muffled phaser swirl kinda sound, and anything higher it just buzzes really REALLY loudly, same with my whammy. But it does like my od and fuzz, i spent the better part of today fiddling with them, still havent figured out exactly how they behave in a feedback loop, but it does exactly what i want: making really weird noises. With my delay set to a kind of stuttery tremolo, and a simple turn of the gain knob i can turn my bad monkey into a better sounding dirty synth apprgeiator than a lot of actual keyboard synths i've used.

Now i just need some paint to repaint my big muff enclosure with a hilariously witty design, I'll post a picture of it with the rest of my pedals in the pedalboard porn thread as soon as my newly acquired sb7 arrives (can't wait to put that in the loop eitheir). Thanks for the help