![]() No, that wiring doesn't make any sense for an on-off-on switch. I did use "modern" opamps, maybe that's the problem.ĭo you remember how small? The Polyfusion goes down to. I highly recommend this mod - it's quite easy and only requires a DPDT on-off-on switch.Īctually started with a smaller cap and wanted to use a center off switch to switch additional caps in parallel.ĭidn't like it with the small cap, and not a lot with bigger caps. ![]() Even the digisound schematics mention using smaller cap values for faster times. It's slow because you didn't try smaller cap values like in the polyfusion schematic. Do want to try that one sometimes, but I suspect that's also too clean and too fast (again for bassguitar).Īs for other options, there's the Buchla 230A schematic, which is apparently very fast and has a lot of bleedthrough. The Bissell one is quite "involved" it sort of a sampler, with three rectifiers being scanned using a 4017 counter. Maybe it just has to be VERY slow (for bassguitar at least) and is that the reason vactrols are often used. Not very happy with it, and since finishing it I've also bought a Analogue Systems RS30 which has a envelope follower which I am also not thrilled about.īeginning to suspect the following of envelopes is not exactly a trivial matter. Haven't checked out the samples (at work now), but I've built the Digisound envelope follower as well (on the original huge layout). Also, the leads from the caps aren't soldered to a switch so I could twist them together on the fly to test out different response times. I had to try out a few different resistor combinations after everything was already soldered in, hence the funny layout and willy-nilly resistor placement. Here's the ugly little thing that I cobbled together quickly using whatever spare parts I had lying around: Same thing except with a drum loop instead of my voice:ĭon't mind the ground loop hum - this module isn't properly grounded yet Here's what it sounds like with my voice on the input signal: With 120K, When I use my Blacet uLFO to generate a 587Hz (D5) 2.86v p/p triangle wave at the AC input, the output of the envelope follower is 5V.įor these two samples, the envelope follower is going to a VCA, the Exponential-FM input of the VCO and the frequency input of my Blacet Filthy Filtre. The voltage output was low so instead of using a 51K resistor for R14, I put in a 120K. I think it would be good to implement the Polyfusion's switchable response time. there's a lot of AC bleed-through as higher input levels (ripple?) I didn't have one so I built the simple Digisound one from this thread last night. Also, it contains no BBDs.Ī friend of mine asked me about what it would sound like to run a voice through an envelope follower controlling a synth. Looks interesting, although I've never heard any build results. Harry's quite big on guitar synths, so my guess is that this design is part of his rig. Of course, if you want the ULTIMATE envelope follower, there's a design by Harry Bissell that uses three similar sections to acheive fast response time AND low ripple on the output: ![]() Wiring it the way shown gives you three positions of 'on'.Įver considered the NE570? Use both sections in series for double-rectification, and then you can raise the smoothing filter cutoff for faster response. Use any Double Pole Double Throw Center off toggle switch. Is this similar to the mythical C&K 7211? Simple, but I dont know if it s any good.Īnybody have any insight into the type of switch specified in the polyfusion design (ST2-6). There is the Digisound 80 Envelope Follower, also, which is probably very similar to the polyfusion (but also has a PCB layout): I don't recall which op-amps I used - probably TL072 or TL082. I'm trying to process filtered drum/sampled loops through my modular, this stuff is dead easy to do in software, but modular sounds a zillion times better, I'm sure there is a really simple solution which evades me.Īdd an inverting output and you are good to go. Subject description: For Moog Moogerfooger/Mutronics Mutator/Daft Punk style filter modulationĬould anyone here help me out with a suggestion for a DIY envelope follower circuit, where audio signals could be fed through it to produce CV outs (+ inverted outs?) to control cutoff and resonance of filters (or whatever ) Mark the topic unread :: View previous topic :: View next topic Moderators: jksuperstar, Scott Stites, Uncle Krunkus Register Profile Log in to check your private messages Log in Chat Room FAQ Calendar Search Memberlist Usergroups Links
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