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Category: Tech

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 »

jFET Transistors : Getting to know Vgs(off) and Idss

By jcm Posted on October 14, 2020 Posted in Tech 2 Comments

JC Maillet, posted Oct22/2020 … A quick look at any good circuit theory book and you generally find jFET device equations written in terms of the process-dependent constants Vgs(off) and Idss. Together,Vgs(off) and Idss pin down the CHARACTERISTIC relationships which …

jFET Transistors : Getting to know Vgs(off) and Idss 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 »

VCS-X “expanded synth modularization” Project

By jcm Posted on June 11, 2020 Posted in Music, Tech No Comments

Dedicated to the memory of Juergen Haible …

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 “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 »

Vintage Designs // Hacks & Mods

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

A list of past designs that were useful to me in study and experiment … 1978 CRAIG ANDERTON “INFINITY PLUS” (POSTED 1998) FLOATING GAIN http://www.lynx.net/~jc/pedalsInfinity.html 1978 CRAIG ANDERTON “RING MODULATOR” (POSTED 1997) VARIOUS ADDED FEATURES http://www.lynx.net/~jc/pedalsBalancedMod.html 1995 SHIN-EI “UNIVIBE” (POSTED …

Vintage Designs // Hacks & Mods Read more »

Non-Linear Analogue Emulation Amplifier

By jcm Posted on March 12, 2018 Posted in Amplifiers, Tech 2 Comments

Introducing: The ATAK-60 “Analogue Tube Amp Killer” // 60 watt version A culmination of the work I started in 1994, with a first official publication of my 12ax7 modeling and simulation plots in 1998. Maillet-GlassAudio98 PDF These plots provide an …

Non-Linear Analogue Emulation Amplifier Read more »

Tubemeister 18 // … the meltdown fix

By jcm Posted on September 20, 2016 Posted in Amplifiers, Tech 10 Comments

auto-bias circuitry ?! … hmmm, is that reliably possible …?! I’m always curious to see what kind of approach these rocket engineers will take to complicate the basic tube amp design … as if the Traynor auto-bias fiasco wasn’t enough …

Tubemeister 18 // … the meltdown fix Read more »

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