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This is the Whirlpool Univibe, a module that is heavily based and inspired by Uni-vibe guitar pedals and creates a very unique vibrato like effect that isn't quite a phaser, but also not quite a chorus. It has a cv input, signal input, and signal output, speed/rate control, depth control, cv signal input attenuator, a switch to select between a square wave and triangle wave for the internal LFO. It runs on +/-12V power and is 5 HP.
Creator commentary:
This was a fun module and is one of my favorites because I was heavily inspired by the Shin-Ei Univibe guitar pedal used by the likes of Jimi Hendrix. It started off as a completely different module/circuit where the main intention was to create a MN3007 or similar based chorus pedal to create a smiliar effect found in guitar pedals such as the EHX small clone pedal. But due to the costs of chips that can create chorus effects and not being to find them in large quantities relatively easily, I decided to look into alternatives.
When doing so, I happened to be listening to Jimi Hendrix's "Machine Gun" in which the pedal was used and instantly found what I was looking for. May not have exactly been a true chorus effect, but the effect sounded so unique and while it is more akin to a phaser than a chorus, I figured it would be interesting to bring that design to the modular realm. So I created a curcuit similar to the original but the main difference was that instead of using a vactrol to control the speed/rate of the circuit, it would instead use a transistor. This was a huge benefit because it was a whole lot cheaper than using a vactrol (which a single one was already a bit pricey), were readily available and allowed for actual control voltage to be used. The vactrol would only output a specific pulse from the led to the LDR, not allowing much expression and changes, just a very flat modulation. While the transistor allowed for waveforms to actually modulate the effect with a whole wide array of expression based on the waveform shape.
At the moment, I haven't just yet made a future panel design as the current one is skinny enough where it would be a little hard to. Not to mention, that I already planned to create an updated module that would have the option to output triangle,square, and sinewaves when adjusting the trimpots on it and might require a redesign on both panels, but we'll see how that goes. There is an issue with this current design as for some reason, I am not able to have instrument level gear (electric guitars, bass, etc) work properly without the use of an envelope follower or similar, could because the module was created with synth-level signals in mind. Something I'm still working on and something I might integrate into the updated version.
