Rebote 2 hiss help please (and I've searched).

[Moon Dog Mane]

Long time lurker, first time poster.

When the Rebote 2 is engaged, there's a background hiss and while it is certainly liveable it is almost like an itch I can't reach to scratch. I'm not referring to noise on the repeats, I'm talking about when the pedal is engaged, at idle with all the knobs turned to zero and the guitar volume all the way down. I'm using metal film resistors, I've checked all my connections, tried using quieter TL072 subs and read just about every thread containing the words "rebote" and "noise". I *think* the noise is being generated at/from the PT2399 but I am not 100% positive. If I remove the TL072 from the socket with the pedal engaged the hiss is still present. I've tried subbing cap values around the PT2399 with no luck. I suspect that I am overlooking something quite simple but is it possible that I am expecting too much from the IC? Thanks for any suggestions.

[Dragonfly]

is the hiss present using power supply, battery, or both ?

[Moon Dog Mane]

is the hiss present using power supply, battery, or both ?

Should have mentioned that, sorry. 

Hiss is present when powered by either or. I looked at the Tonepad Rebote 2.5 project and Franciso mentions better filtering but after reading the build reports I suspect it refers to the repeats.

[MikeH]

http://www.diystompboxes.com/smfforum/index.php?topic=62512.0

This might help

[Moon Dog Mane]

http://www.diystompboxes.com/smfforum/index.php?topic=62512.0

This might help

Thanks Mike but I believe that thread refers to the fidelity of the repeats.

[A.J.]

I've got the exact same problem with my 2.5 - a background but really quite noticeable hiss when the pedal is engaged (run by battery) - the repeats themselves sound fine.

I've tried a couple of different chips in there (OPA something or other) and nothing seemed to help....I don't really use the pedal much because of it....

Maybe I'll poke around with it tonight....


A.J.

[Moon Dog Mane]

Bump in case someone who knows something missed this thread. Thanks.

[Auke Haarsma]

You may like to have a look at the GGG PT-80, which uses a compander/expander to keep the SNR low.