DIY True Bypass/Feedback Loop (aka KROK)

[expanoncolin]

Dear Colin,
HUH?

 Michael.

Ignore the 10k pot and 22k resistor at the bottom.  Use a dual gang pot for the other two 10k pots, and wire them in opposite.  Use the guitar as IN 1 (may need to boost it) and the feedback loop output as IN 2.

-Colin

[MBackus]

Dear Colin,
HUH?

 Michael.

Ignore the 10k pot and 22k resistor at the bottom.  Use a dual gang pot for the other two 10k pots, and wire them in opposite.  Use the guitar as IN 1 (may need to boost it) and the feedback loop output as IN 2.

-Colin

Okay, as crazy as this seems, I'm understanding what you are saying, except, what do you mean wire them opposite?

[expanoncolin]

Okay, as crazy as this seems, I'm understanding what you are saying, except, what do you mean wire them opposite?

Wire them so that the ground connection is on the opposite side lug.

-Colin

[alpeperker]

i have just finished wiring the krok, but it doesn't work. i have a bypassed sound, but it will not engage when i hit the footswich. i have checked my soldering, it looks good, and my connections are how they should be. its just the loop that doesn't work not in loop mode, not in feedback mode
.could you help me out?

[expanoncolin]

i have just finished wiring the krok, but it doesn't work. i have a bypassed sound, but it will not engage when i hit the footswich. i have checked my soldering, it looks good, and my connections are how they should be. its just the loop that doesn't work not in loop mode, not in feedback mode
.could you help me out?

Quadruple check your wiring.  If you have a multimeter, check to make sure none of the wires are shorting to the case or ground.  If all else fails, take it apart and re-wire it.

-Colin

[pandy3000]

GUys last post.
I have put a DPDT switch instead of a SPDT switch and 2 LEDs. At the moment When i press the 3PDT swicth, the signal goes through the pedals in the loop. Then when the DPDT is pressed it goes into feedback. Ive got to have the 3DPT down first for the feedback to work. I want it so that i can press the feedback and it to go from bypassed (off) to feedback. And so that when the feedback is pressed just the feedback LED lights up cos at the moment they both light up if i am in working feedback mode.
deos this make any sense?

[expanoncolin]

GUys last post.
I have put a DPDT switch instead of a SPDT switch and 2 LEDs. At the moment When i press the 3PDT swicth, the signal goes through the pedals in the loop. Then when the DPDT is pressed it goes into feedback. Ive got to have the 3DPT down first for the feedback to work. I want it so that i can press the feedback and it to go from bypassed (off) to feedback. And so that when the feedback is pressed just the feedback LED lights up cos at the moment they both light up if i am in working feedback mode.
deos this make any sense?

That makes sense, though that's not at all how the pedal is intended to work.  To get a switch that bypasses/unbypasses AND brings in feedback, you will need to wire a bypass switch where the "send" and "receive" are permanently wired together through a pot.  In this configuration, a bypass/unbypass switch (wired normally, without feedback) won't have any effect when you bypass or unbypass it if the feedback switch is engaged, even though the LED will turn on and off.

-Colin

[tombola]

I just wanted to offer my thanks to Colin.

This thread has been running for six years, and he has been absolutely patient and helpful to all comers - answering the same question over and over again.

That's the definition of a true teacher, and there are a lot of people inspired to make strange noises now because of you.

Thank you, Colin.

[expanoncolin]

I just wanted to offer my thanks to Colin.

This thread has been running for six years, and he has been absolutely patient and helpful to all comers - answering the same question over and over again.

That's the definition of a true teacher, and there are a lot of people inspired to make strange noises now because of you.

Thank you, Colin.

Of course!  It gets easier after the 100th post 

-Colin

[alpeperker]

I guess you have had this question about a houndred times but, anyway.
i've built the thing and it works fine as a looper pedal. no problem bypassing it. but it will not turn into feedback when i engage the toggle for the feedback, turning the pot doesn't make any diffrence. i crosschecked every solering, so that part shoud be okay. where could there be a mistake? could it possibly be the pot which has broken or likewise?
Hope you can help.
-Jon

[expanoncolin]

I guess you have had this question about a houndred times but, anyway.
i've built the thing and it works fine as a looper pedal. no problem bypassing it. but it will not turn into feedback when i engage the toggle for the feedback, turning the pot doesn't make any diffrence. i crosschecked every solering, so that part shoud be okay. where could there be a mistake? could it possibly be the pot which has broken or likewise?
Hope you can help.
-Jon

What pedal is in the feedback loop?

-Colin

[alpeperker]

About every pedal i own. Several distortions, fuzzes, reverb, chorus, tremolo, wah.. i also tried single pedals, but it didn't change their sound, just swiched them on and off when i stomped the swich of the looper.

[expanoncolin]

About every pedal i own. Several distortions, fuzzes, reverb, chorus, tremolo, wah.. i also tried single pedals, but it didn't change their sound, just swiched them on and off when i stomped the swich of the looper.

Triple check your wiring - one thing you can do is plug cables in to send and receive, and test to see if you get a resistance between their tips when feedback is engaged.

-Colin

[alpeperker]

My multimeter has just given up life today, so i'll try to fix it tomorow and try it.
Thanks Colin. If it doesn't work, i might return. 

[evolvedboredom]

Hi, this is a new hobby for me. This is my first pedal build and I'm having some problems. At first, I was getting nothing. I'm running the Feedback Looper (FBL) through my OS2 pedal. When I activate the OS2, my guitar plays through clean, not distorted like it should, when I turned up my amp I could hear a slight squeal from the non-active FBL, when I activate the FBL the squeal is increased a substantial amount and the distortion comes alive. I should mention, when the FBL is off the strumming does not effect the squealing noise, and when it's active, it doesn't have any effect on it either, but playing around with the knobs is fun...for a little while I s'pose. I'm confused with this simple design, have gone over the diagram three or so times. I'll have to double check in the morning I guess. I hope you guys/gals can help me help myself out!

http://s89.photobucket.com/albums/k211/nirvana893/Feedback%20Looper/

I don't have a multimeter/or know how to use one yet either.