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Category: Effects

Vintage SHINEI UNIVIBE – restoration and enhancement

By jcm Posted on May 9, 2022 Posted in Effects, Tech No Comments

A couple of years ago I thought I’d spend my life savings on a 60’s SHINEI Univibe phasor. I managed to track one down on eBay and immediately fell for it! The unit was dead right out of the box …

Vintage SHINEI UNIVIBE – restoration and enhancement Read more »

viva Analog “Octave Splitter” // jcm(c)2018

By jcm Posted on September 30, 2020 Posted in Effects, Tech No Comments

pushing sleep late one night, I randomly started drawing out a sine wave and reflected on a visual representation of the usual frequency doubling transform known as “full-wave rectification” … I bemusedly wondered if there could be another way of …

viva Analog “Octave Splitter” // jcm(c)2018 Read more »

viva Analog “6G VIBRATO” // jcm 2020

By jcm Posted on July 13, 2020 Posted in Effects No Comments

On my list for the last two years, a compactified redux of my precision emulation of the original late-50’s Fender “Harmonic” Vibrato effect. The circuit is based around a Univibe style LFO oscillator which drives a pair of OTA’s in …

viva Analog “6G VIBRATO” // jcm 2020 Read more »

WAYNE Choratone // LATTICE BALANCING update 2020

By jcm Posted on June 10, 2020 Posted in Effects, Tech No Comments

While searching for a non-code based (AVR) way of doing 3-phase speed control on the WAYNE Choratone concept I found a way to discretizing the phase rotation so that an easier way of balancing the Lattice outputs becomes possible. Instead …

WAYNE Choratone // LATTICE BALANCING update 2020 Read more »

viva Analog “1176x” // jcm(c)2020

By jcm Posted on May 31, 2020 Posted in Effects, Tech No Comments

viva Analog “1176x-tended” Limiting Amplifier my take on the celebrated giant …  CONTROLS: PRE // Input scaling (affects RATIO and THRESHOLD range) POST // Output (overall) gain THRS // minimum Threshold (high sensitivity) at full rotation RATE // maximum Ratio …

viva Analog “1176x” // jcm(c)2020 Read more »

viva Analog “NW-Octaver” // jcm(c)2019

By jcm Posted on May 16, 2020 Posted in Effects No Comments

My third and final effort with this approach, first running at 30vdc (“Octave Amp” jcm(c)2009), more recently with a Treble control added. The circuit is now adapted for operation at 9vdc, and boxed into a more compact format. Smooth rectification, …

viva Analog “NW-Octaver” // jcm(c)2019 Read more »

viva Analog “HARD-MOD” // jcm(c)2019

By jcm Posted on May 11, 2020 Posted in Effects No Comments

Binary RING MODULATION, Nyquist Aliasing, BOOLEAN 1bit A/D Distortion, … they’re in that same league … A recent invention of mine, this one could be regarded as a Ring Modulator, but with a (0/1) square wave (carrier) operating at one …

viva Analog “HARD-MOD” // jcm(c)2019 Read more »

viva Analog “LA-2A”// jcm(c)2019

By jcm Posted on May 5, 2020 Posted in Effects No Comments

I just realized a few years back that the EHX vacuum tube based “Black Finger” (BF) optical compressor (limiter) is really an UREI “LA-2A” Limiting Amplifier derivative in disguise. As we all know, the LA-2A is considered one of, if …

viva Analog “LA-2A”// jcm(c)2019 Read more »

viva Analog “SUB-MUX” // jcm(c)2019

By jcm Posted on May 5, 2020 Posted in Effects No Comments

Inspired by early British synthesizer designs, a very fast decision circuit allows precise cutting off of signal between consecutive periods to produce the illusion of artificial octaves … and, unlike the OC-2 where the signal path has all the highs …

viva Analog “SUB-MUX” // jcm(c)2019 Read more »

viva Analog “Precision Shifter” // jcm(c)2018

By jcm Posted on May 1, 2020 Posted in Effects, Tech No Comments

Bagging a new Phasor circuit … To recap, all monaural time-based effects – which includes Delays, Phasors, Chorus circuits and Flangers – all tend to follow a similar overall structure comprising of three main parts: (i) a signal path that …

viva Analog “Precision Shifter” // jcm(c)2018 Read more »

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