Here is a layout for the Rebote LFO mod.

[slacker]

On the Rebote circuit board lug 1 of the delay pot is connected to ground, you disconnect this wire from the rebote circuit board and attach it to the LFO board to where its says "Delay Time pot 1". This puts the LDR in series with the delay pot so as its resistance changes it changes the delay time.

[alex frias]

I think there´s a mistake on this layout/pcb...
The LED that drives the LDR is not properly connected.
See the pic below, is it correct according to the circuit?

[alex frias]

This circuit:

[mcasey1]

I believe you are referring to the 1.3K,1K junction.  I think that it is fine to run the traces this way.  Someone let me know if it isn't.

[alex frias]

Please, tell me if I'm wrong.
Tonight I will conclude this MOD and I will soon report the results.
Thanks to everybody here.

[mcasey1]

The layout follows the schematic.

[ADR]

Cool, I have a Dano Fab Echo that I was gonna mod for a delay time and rehouse it, but I might make one of these LFO boards for it. (BTW, this fabecho has the fullsize PT2399 IC).

[alex frias]

Well,

At last I´ve found enough spare time so I finished and tested the circuit in my Rebote.

It didn´t work at first. maybe the 10uF cap that I used, an old used one, was not that good.

So I decided  to change the values of some components to get the same as Tremulus Lune LFO, as it looks the same.

The changed component values are:

R4 - 100R
C2 - 100uF
Speed Pot - 10K

Then it worked great!

I´ve made some experiences and found interesting stuff:

1 - change Depth pot to 5K and use a SPDT to insert a 1k8 resistor in parallel and you get two possible modulations depths: smooth and weird
2 - use a switch (SPDT) to conect the noninverted input of OpAmp 2 on one of each side of R5-470K resistor, it will substitute the SMOOTH control found in Tremulus Lune, this way you get 2 waveforms to modulate the Rebote, usefull but no a must
3 - Put another switch to turn off the direct sound, usefull for special effects or combine with effects that offer send/receive loop, like my McMeat filter. It´s amazing!
4 - use a roll off filter using just a pot and a cap to ground, like the ones you have on your guitar controls. It helps in higher delay times and to achieve some good ambient effects
5 - If you want, you can mess with the cap to get other ranges of modulation speed, even Ring Mod sounds aproximations

This LFO made me a believer!
Now I can tell you: you get good chorus sound out of those Rebote's and PT80's delays. De Luxe Memory Man simulations, great chorus, UFO's and  lots of weird stuff.

[yeahyeah]

Cool alex!

Do you know the light and dark resistance of the LDR you used?

[alex frias]

I always use the same LDR, I don't remember right now the values, but I think it's about 10M to 5K.
I think if it's not the same, you can simply adjust the resistor in paralel with the pot.

[marmora]

I know most people have moved on to the Echo Base now, but I had an LFO board etched a while ago and finally got around to putting this together.
I really like the sounds I'm getting with this.  I'm using it with a Rebote 2.0.  Depth pot is 5k and Speed pot is 10k.  My wife said it sounds "pretty".  Always good news!

[stratman7000]

Hi there Im interested in building this mod to my 2.5 rebote delay... How ever I have a question. I know that the LFO is a signal generator... How ever I would like to know if the End result of building this mod will give me CHORUS or will it be just a Tremolo effect. 

[stratman7000]

I finally got a chance to build this mod to my Rebote 2.5 and it Works!!! it gives a really nice chorus effect.  I how ever have my pots reversed. I used the same values stated but they are counterclockwise, If any of you know how to fix this please let me know  =)

[defaced]

I how ever have my pots reversed. I used the same values stated but they are counterclockwise, If any of you know how to fix this please let me know  =)

Swap the outside wires on the pots. 

[stratman7000]

I how ever have my pots reversed. I used the same values stated but they are counterclockwise, If any of you know how to fix this please let me know  =)

Swap the outside wires on the pots. 

Thanks... that worked