DIY truebypass/feedback loop

[heavyfunkmachin]

i want to this, it´s like a true bypass BUT fliping a toogle you get a feedback loop... with a knob to control feedback amount, and it would be PERFECT if it had another one to control the output volum (only in feedback loop function)....

where can i buy this? i think in DIY because the one i saw on ebay didnt have a volume knob and was awfully expensive... this will be my first diy pedal, but i think i can do it...

anyway, where can i buy the parts? CONSIDER I LIVE IN SPAIN, SO IT MUST SHIP OVERSEAS...

thanks a lot...

[Denyle Guitars]

It's easy to DIY.

[gnasher1993]

This schematic is just what you need:



A parts list for you:

4 x 1/4" mono jacks

2.1mm DC jack

500k Log. Potentiometer

LED

Resistor (I'd suggest 3.9k)

3PDT footswitch

SPDT toggle switch

For parts, I'd recommend "Das Musikding" in Germany. Great service and they'll ship to you. I've just checked for you and it'll cost you 10,03 EUR plus shipping.

I hope I've helped .

[heavyfunkmachin]

GREAT!!!!!!!!!!!!

BUT HOW CAN I ADD TO THHOSE DIAGRAMS A VOLUME POT??

CAN IT BE ADDED SO IT WORKS ONLY WHEN THE FEEDBACK LOOP IS ON??

(thanks a lot, REALLY)

[gnasher1993]

To be honest, it would be complicate things quite alot of if you wanted to put the volume control inside the box. There's probably a way to do it but I think it would be easier to just put a passive volume control between the output of the pedal in the loop and the effects return of the looper.

[heavyfunkmachin]

oh!


i thought it would be really simple... just a pot with the right wiring... but then i have no idea...

why would it be so complicated?

why is simpler to but a volume pedal box after it?

[gnasher1993]

It really depends. Do you want to boost the signal of the pedal in the loop? If you don't want to add any volume then yes, a single potentiometer would work fine .

[heavyfunkmachin]

all i want to do with the volume is turn it down because the true bypass might be louder than my effect pedal chain final output, so i was thinkig about being able to have a true bypass clean tone at the same volume than my effect signal... AND because the last pedal in the pedal chain is a rc-20xl looper that i dont want to clip when feedback loop is crazy noisy, so i can turn the feedback knob up to hell-of-a-noise level without clipping amp or looper.

would adding a volume pot to the true bypass make the bypass "less" true bypass or something?

by the way, i just bought the needed parts, but no led... who needs it anyway! thanks a lot the help you're giving me!!!

[Denyle Guitars]

Just add the volume pot immediately after the fx return jack. On Gnasher's schematic, cut the yellow wire and connect the two halves to lugs 2 & 3. Connect lug 1 to ground.

edit: I just saw that you want it on the TBP side. In that case, place it between the short red wire on the 3pdt switch.

[heavyfunkmachin]

WOULD IT BE LIKE THIS?

i want the volume pot to control both volumes: when true bypass is on and when feedback loop is on.

as you might guess, im clueless

[heavyfunkmachin]

uhmmm thinking about it, woundt it be like this to get the desired effect?

[gnasher1993]

That schematic isn't true bypass, do you realise that?

[heavyfunkmachin]

ups!!!

As you already figured out, im clueless....


BUT, tried again, should it look like this????

(thanks for your patience)

[john turner]

sounds to me like you want two different things that aren't going to both be able to be done with just one pot.

1) you want to be able to passively (cut only) equalize the volume between your clean signal and your effect return. (i.e. this counteracts the concept of "true bypass" in that your bypass does not only hit wire, but also components. so not true bypass anymore).

this would require you to put a pot in line with the red signal input jumper of the 3pdt switch (in between posts 1,1 and 2,3). tie the middle pin of the pot to pin 2,3 of the switch, one side of the pot to pin 1,1 of the switch, the other to ground. this will enable you to attenuate your bypassed signal without impacting your send/return signal. this is like what denyle guitars said.

2). sounds like you also want to be able to affect the volume of the return from the looper when the feedback loop is engaged. i would think this would be best done with a 2nd pot in line with the signal return (yellow wire) from the loop. this way you can turn the return down when you want to pump the feedback up, and it has no effect on the bypassed signal when the loop is off.

[Kooldac]

Edit: John made good points that covered mine and more...

[heavyfunkmachin]

Originally Posted by john turner

1) you want to be able to passively (cut only) equalize the volume between your clean signal and your effect return. (i.e. this counteracts the concept of "true bypass" in that your bypass does not only hit wire, but also components. so not true bypass anymore).

HI!

first of all, thank you very much for your reply... it makes a lot of sense...

regarding the bypass.. I´m thinking that since my pickup's signal already goes trough a volume pot... adding another volume pot woudnt hurt much, would it?

[john turner]

no, i don't think it would hurt at all.

[heavyfunkmachin]

so, just to double check, this scheme would be right?

[john turner]

that looks good to me. actually looks like a pretty decent pedal. might whip one of those up myself.

also, realize, that if you don't want the led you don't need the 3pdt switch - a dpdt will work, just ignore the last column.

[gnasher1993]

Originally Posted by john turner

that looks good to me.

Agreed...we got there .