Rebote 2.5 Issue - Runaway Repeats

[Zben3129]

Finished building a Rebote 2.5 from the tonepad layout, however the repeat signal is just a runaway repeat of some horrible, non-guitar-like, noise. With the mix set to full clean, a clean sound passes no problem.

Also, I noticed that when I first connect the battery (hooked battery up to a footswitch for debugging purposes), I can get 1 or 2 guitar tone repeats before it gets completely distorted beyond recognition.

Decay knob has an effect on the sounds, it changes the frequency and pitch of the sounds.

[elfito]

i have the same problem!
i used al the parts needed for the roject,the only subtitution is the input cap wich i belive is not part of the echo part of the circuit.
on my it happends after a few minutes of use

[jkokura]

I've got my version working just fine, so you can know it's not the circuit that's the problem. It sounds to me like your pots either aren't connected properly or they're backwards. If you'd like more help, go read the debugging thread - it's a sticky in this forum. Follow the instructions for giving us information and we can help you find the solution hopefully. Both of you.

Jacob

[Zben3129]

Elfito, check to make sure you are using a 25k pot for the repeat pot and also used the 15k resistor in the repeat section. It sounds like yours is right on the edge of runaway perhaps and then something sets it over the edge.

Mine turned out to be a bad repeat pot which was giving me way more than the 0-25k ohm range, replaced it and the runaway issue is fixed.

Now, however, I can only get 1 repeat no matter where the repeat or decay knobs are set. I can get the proper range of times, but it is always 1 repeat no matter what. Also, the repeat buzzes/distorts with the guitar volume anywhere past 3.

[R.G.]

Finished building a Rebote 2.5 from the tonepad layout, however the repeat signal is just a runaway repeat of some horrible, non-guitar-like, noise. With the mix set to full clean, a clean sound passes no problem.

Any effect which generates repeats by recirculating a delayed output (this one does) absolutely has to have the amount of signal level fed back into the input be smaller than the signal first going into the delay. If this is not true, the repeat signal is bigger than the input signal which created it in the first place, and delays of the repeat get bigger every pass through the delay. It quickly builds up to full-scale nastiness.

Your problem (in general) is that your repeats loop is not cutting the delay signal down to smaller than the input signal so it won't run away. Anything involved in the repeats path which is not doing its part of cutting the repeats volume fed back into the input down to less than the signal which originally created it can cause this. I would personally suspect a bum repeats pot or wiring thereto first. Bad ground connection to any part in the repeats path can do it too.

[skrunk]

I just finished up one of these.
I put the 15k feedback resistor on a switch with a 10k to try get infinite repeats (or close enough to) with the repeats knobs up full.
It just gave me a few more repeats though and not nearly as much as I'd hoped, so I'll guess I'll try something lower than 10k.

[Treso]

Which resistor effects on volume of the repeats?? I want to increase volume of them.

Thanks

[arma61]

Which resistor effects on volume of the repeats?? I want to increase volume of them.

Thanks

from this topic
http://www.diystompboxes.com/smfforum/index.php?topic=71129.0

lift the right side of the 33k resistor above IC2 (you can actually make it 15k or 20k, you will have more volume control on the repeats only, at 33k unity between dry and delayed signal is when level pot is maxed but sometimes in band settings you loose the effect, reducing this resistor will have unity at 75% travel of the pot, leaving you a 25% boost for the wet signal)...