Colorsound SupaSustain Project led/ldr? from GGG

[jimbob]

Im wanting to build this but dont really unserstan the purpose of -from what i gather-connecting a led to this ldr? thingy? with shrink tubing. Whats its purpose? this is taken from the ggg site project.

[saxtim]

Hi,  I built this thing a couple of months ago and couldn't getting working correctly (or at least I think so.)  It ended up working as a fuzz style box, not a clean compression.  There was a bit of contention about whether or not the originals did this or not.  I tried a lot of experimenting with biasing the transistors with trimpots, but could only getting it working as a fuzz.  It does give a bit of sustain though and it's reasonably nice sounding.  The heat shrink tubing is to couple the LDR and LED optically - ie it basically makes sure that limited external light reaches the LDR buy covering it with tubing.  That way when the LED lights, it lights the LDR more effectively.  Basically it's about giving a wider range of resistance values from LED off - on.  That part of the circuit is an envelope follower, so the LED goes on and then dims according to signal present in the circuit.  

Oh, and if you use the orignal transistors from small bear (can't remember the part hand) be careful with the pinouts.  I'd recommend sing a 2n3904 as it will fit the GGG layout.


Be interested if anyone has an original if they can recall if it was a distortion style effect - so I know if mine is doing what it's supposed to be doing.

tim

[jimbob]

Nuff said- im going to move on to another project- no need for complications or problematic effects. I work on 6-7 diff projects at a time. Why risk loss of time.

thanks