RE-DEFINING BBD CHORUS DESIGN PARAMETERS The Problem with Traditional BBD Chorus Analog chorus pedals based on BBD delay IC’s have a distinctive metallic edge that many players – including myself – find fatiguing. The root of the issue lies in …
The original circuit that I’m demo’ing here doesn’t exist on the guitar market today. Unlike other compressor designs this one operates purely on a mathematical principles – that is, the servo principles of Control theory … as a result the …
A few years back I went through a brief “mixed-signal” design phase – mainly with the intended purpose of seeing how far I could get using off-the-shelf CMOS analog gates driven digitally. Yes, similar to how Keith Barr did it …
William Wayne designed an interesting contraption which aimed to de-synchronize the output of (synchronous, ie., Hammond) tone-wheel organs; that is, to produce a chorusing effect. It is said that Jimi Hendrix played thru a (vacuum tube based) unit manufactured by …
WAYNE CHORA-TONE PROJECTOR DIY // JC MAILLET (c) 2016/2023 Read more →
Get my pdf copy of IFMTA and include your choice of login name … viva Analog – Work Forum
// RESEARCH PERIOD: 2004-2023 // ** ORIGINAL ALL-ANALOG fx AUDIO CIRCUIT DESIGNS ** BFP #1 … GERMANIUM-TO-SILICON HARDWARE SIMULATORS This BFP hits guitarists where it counts, by pushing the world’s most notable vintage dirt circuits into new upper territories of …
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 →
The “EA Preamp and Vibrato” by Anthony Leo, published by ELECTRONICS Australia (Nov/1968) is a very simple Tremolo (rd. amplitude modulating) circuit. It is, yet, another effect circuit that relies on a jFET operating as a Voltage Controlled Resistor (VCR). …
JC Maillet, posted Oct22/2020 … The idea of “frequency doubling”, also known in modern times as “squaring”, comes from the idea of multiplying a sine-wave ‘sin(wo)’ against itself … producing product terms at sin(wo-wo) and sin(wo+wo), or DC and sin(2wo) …
FW-Rectifier based “up-Octaver” Designs // jcm(c)2020 Read more →
JC Maillet, posted Oct22/2020 … jFET transistors are considered “DC matched” when their respective Vgs(off) and Idss values are identical, or close enough, to each other. Of course, there is more to jFET device matching not covered by those two …
In 2003 I put out a mod that when applied to my Green Ringer clone made it work and sound better … I called it my “GREEN RINGER NULLING” mod! To be fair, this made sense from a theoretical point …
DanElectro “Green Ringer” MODS-redux // jcm(c)2020 Read more →
The DanElectro “Green Ringer” was designed to have just enough gain to turn “over” the rectifying section, but not enough to produce an output higher than unity when converted to octave – a clever balancing act !! Since the DanElectro …
DanElectro “Green Ringer” unleashed // jcm(c)2020 Read more →
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 →
JC Maillet, posted Oct22/2020 … Full-Wave (FW) rectifiers have many uses in electronics. Although they are typically seen in Linear Power Supply circuits they can also be used for processing signals, as seen in such circuits as Frequency Doublers and …
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 …
SOME BACKGROUND … Being absolutely NO expert in historical anything my understanding is that Keith Barr created the MXR Phase90 and Phase45 in his garage around 1973 and put them on the market the following year. We can say that …
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 …
Dedicated to the memory of Juergen Haible …
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-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 …
