Did a clip more, this time with the BEF-P; effectively putting it in an effects loop (like the Groove Regulator has): https://soundcloud.com/skrogh/expression-envelope-befp
This time with a USB sound card, so the sound is a bit nicer. The link has more info about chain and setup.
Next thing will hopefully be to make it work on my M9; as that would open up a lot of possibilities. (I'm thinking chorus/vibrato, reverb, filters, ringmod, synths and delay at the moment)
I hope I'm not stepping on your toes by making this, as I could understand you might be working on something similar; but I've had the idea in my head since about when the MWBD Pro came out (2-3 years back) and now, being an electrical engineer student, I finally have the skills requited to do this the way I want to.
Oh, not at all. I'm glad someone else has taken interest in this kind of thing. What control method did you go with?
I've considered a single LDR and a fixed resistor, which may give a suitable sweep. I also thought of a 3-resistor voltage divider with the LDR in the center and JFETs tapped off either side. One side would pull closer to V+ and the other to 0V.
The envelope distortion sounds cool. I did a small one with a single gain stage. It used LEDs as clipping elements and the LDR as the feedback resistor. If you're on diystompboxes the schematic is there somewhere.
On the M9, I think that'd be easier. IIRC it just uses a variable resistance for expression control, rather than a voltage divider. So a single LDR/JFET would work.
__________________ fretless club #652
Originally Posted by behndy
...10 minutes into our set i was like, "i..... am... on acid. huh.".
Last edited by Derek Balonek : 02-03-2013 at 07:11 PM.
As I wrote earlier, I've acquired a digital potentiometer, so I just interface that with a microprocessor.
This also allows me to have both envelope follower, envelope generator and LFO in the same package.
A TSSOP (RU-14) package with an iron half the size of a pinkey.
The soldering took about 2 hours I think, PCB design and etching included. The rest was coding. I've been coding for about 8h more today.