built my rebote delay

[Seljer]

I put this thing together last night, tested it this morning, sounds great except for a hiss that comes in with the delays. This was going to be a debug thread but I just realised I used 8.2nF instead of 82nF caps
though I'm still very happy with this thing overall, worked the first time I tried it

testing it on my breadboard with trimpots 

(behold my jumble of capacitor and resistor types)

I put up some soundclips as well (though you can hear a bit of that hiss in there)
http://aronnelson.com/gallery/album113

Now just to get a box for it

[alfafalfa]

Seljer,

A very nice built rebote, but what's more I do hear the same kind of hiss ( in my ears it's more a built up distortion ) that I also hear in my build , only with the longer delays.
To me this proves that it doesn't have to do with the way I built it but with the shortcomings of the chip , I think.
Would like to hear some more opinions about this .

Alf

[Cardboard Tube Samurai]

Very nice indeed! This seals the deal for me, this is going to be a project for me in the near future (just after the Small Stone Phaser)

[Seljer]

I replaced the to caps, the delays are fine in the top 50% of the pot (somewhere around 250ms and under), you start to hear that distortion/hiss if you go longer than that but its not something I'm too bothered about (I end up creating some kind of huge feast of noise in either way when I use those longer delays), and like somebody else mentioned in another Rebote thread I was looking over, when you've got a full band you don't really notice it

edit: if you're using it after a distortion pedal then the hiss and stuff is absolutely not a problem at all
you just get a lovely lo fi sound in the repeats

edit2: recorded something dirty

guitart -> tubescreamer -> rebote on max delay time -> clean amp
http://aronnelson.com/gallery/album113/rebotebadzztop

[oldrocker]

I perf boarded this a little while back and mine doesn't look anywhere near as nice as yours.  But it sounds the same and its one of my favorite pedals.  With really short one echo delay settings it almost sounds like a reverb.  I love the slapback echo along with some distortion because it makes the guitar sound huge.  See my sloppy board below.  I used tants for the 1uF caps which seemed to work out good.
http://www.logmonster.com/images/full/?pic=Rebote25_1161671146-422-14106.jpg

[blanik]

this hiss thing has been mentioned here often... i started a tread on the same thing couple of months ago... i was told by the powers that be (the competent guys) that this hiss is totaly part of the PT 2399 chip but like most people say: with some kind of distortion you won't notice the hiss.....

and besides, i like the hiss, i had the same kind of hiss on the repeats in my Roland Space Echo (tape echo) so my Rebote is now my Space-Echo-Lite-That-Works-On-A-9V-Battery   

here's mine that i modded to be stereo and added a switch (the 2PDT) for endless repeats... instant 60's 




R.

[Fp-www.Tonepad.com]

nice rebotes everyone!

[blanik]

the credit goes to you Mr Pena 

[jonathan perez]

wait til you see mine 

[Barcode80]

blanik, can you detail your mods a little more? i'm building this soon and both mods you mention sound like something i want to incorporate.

[markm]

Either I don't notice the noise, or I'm losing my hearing or, mine's quiet. 

[rockgardenlove]

What's the stereo mod?

[blanik]

Either I don't notice the noise, or I'm losing my hearing or, mine's quiet. 

it's ok grandpa, read my lips... my lips grandpa.... 

[oldrocker]

I wrote this before but when I first built my Rebote I could swear there was absolutely no noise (hiss).  The next day it stopped working and I found a cold solder joint or two.  Well I fixed the problem only to now have the noise everybody has with this.  The Tonepad site admits the hiss is inherent to the PT2399 chip.  When I first built it and didn't have the noise problem I laughed thinking I had the only noiseless Rebote but it seems Mark M. owns it now.     My hearing is not what it used to be but I definitely have the hiss but it's not too bad but I was going to try and revisit this to see if I can find out why or how mine worked before I fixed it.

[sfr]

The hiss is so high enough that not every amp will actually reproduce it audibly.

[markm]

Either I don't notice the noise, or I'm losing my hearing or, mine's quiet. 

it's ok grandpa, read my lips... my lips grandpa.... 

WHAT'D YA SAY SONNY??!!

Ya know, it'd be interesting to see if the PT80 has the same issues.

[Fp-www.Tonepad.com]

rebote does have some hiss in it.

[blanik]

STEREO REBOTE



i modded mine for stereo, so i have the dry signal on one jack and ONLY the delayed signal on the other...
i lifted the outbound leg of the 33k resistor coming from the wiper of the level pot (and i changed the value of that resist. to 22k so i can have the wet signal louder if i need to)...
you can see the 2 black wires coming from over the small IC (on the picture of my delay higher in the tread), that's where the 33k was, i just put wires there and put the resistor on the jack... (it's a switching jack so if i don't plug anything in there, the two black wires (and the resistor) close the loop and go back to the board so it work like the regular mono rebote (wet and dry mixed)

i had some problem in stereo mode when bypassing (3PDT true bypass) cause the sound stopped coming out from the second output (wet) so i had to use a millenium bypass for the LED (stuck between the 3PDT and the enclosure... far left on the pic) and that gave me a free switch on the 3PDT... to sent a dry signal to the (wet) output when the effect is bypassed...

...but that created another problem! when bypassing in mono mode the now connected to dry signal closed switching jack would induce weird a sound when playing... bummer  so i had to install a tiny switch between both output jacks to cut the new wire when in mono... small sacrifice lol

nelson told me about the 33K point for stereo signal... 

for the infinite repeats on a stomp (aka: the instant Hendrix Acid Trip on a stomp  ), just short the wires of the repeat pot with a switch and it'll do the same has if you'd turn the repeat pot at max... but this will only work if you did the 15k to 10k mod as specified on the Tonepad PDF...

R.

[oldrocker]

I had heard the PT-80 has a compander or something to help with the long delays and supposedly doesn't suffer from the hiss.  Personally I like the Rebote.  Nice sounding delay IMHO and was a fun build.  I may take on a PT-80 someday but I'm working on building the FSH-1 at the moment.

[heyniceguy]

blanik.... question about the stereo mod....

looking at the schematic, if you output the wet signal before the final inverting buffer, then your wet signal will be 180 degrees out of phase from the dry signal (assuming the delay chip doesnt introduce any phase shift in itself, which it shouldnt, if the designer wasnt a hack)...

do you experience any phase cancellations when running this in stereo?