One-shot Event Generator

Posted by & filed under Envelope Generators, LFOs, Projects, Stompbox stuff, Synth DIY.

Here’s something slightly different! Is it an LFO? Is it an envelope generator? Well, it’s a bit of both. It produces a one-off event like an envelope generator, but it has a selection of waves more like an LFO. It works by producing a single “ping” when triggered. A ping is like a mini-envelope. The rate and waveshape of that ping are variable (from 55 msecs to 2.5 seconds, and eight different shapes), and the single ping can be augmented… Read more »

Electric Druid chips: The Next Generation

Posted by & filed under Envelope Generators, LFOs, Projects, Stompbox stuff, Synth DIY.

In the last six months, we’ve been very busy here in the Druid workshop, developing and testing new versions of our PIC-based chips. This work is now complete, so I’d like to introduce the new chips. Why bother? What was wrong with the old ones? Ok, there wasn’t anything much wrong with the old ones, but things have moved on since 2008 when most of them were originally developed – ten years ago already! Most importantly, Microchip have released a… Read more »

Voltage Controlled Looping Envelope Generator

Posted by & filed under Envelope Generators, Projects, Synth DIY.

This project is a development of my earlier VCADSR envelope generator. Whilst that chip had both GATE and TRIGGER inputs, this chip replaces the TRIGGER input with a MODE CV that allows selection of normal ADSR, Gated looping, or full LFO-style Looping modes. Standard ADSR mode generates the shape you expect, and allows CV control of envelope depth and overall time. Gated looping mode loops while the Gate is high. When the Gate goes low, the envelope goes to the… Read more »

Moog 911 ADSR Envelope Generator clone

Posted by & filed under Envelope Generators, Projects, Synth DIY.

A clone of a classic using my PIC code by J-P Desrochers Jean-Pierre Desrochers wanted to copy the response of the Moog 911 envelope generator using more modern technology. He asked me if it would be possible to tweak the response of my PIC envelope generator to do this, and I told him that it would, since the control mapping is stored in a table in the code. JP worked out the required table values and a front panel design…. Read more »

Voltage Controlled ADSR Envelope Generator (VC ADSR 7B)

Posted by & filed under Envelope Generators, Projects, Synth DIY.

A CEM 3312 / SSM 2056 clone using cheap PIC microprocessors This page describes a cheap clone of the CEM 3312 and SSM 2056 voltage-controlled envelope generator chips. Both of these chips include voltage control of A, D, S and R, but both include other inputs too. The CEM 3312 chip has a input which controls the final envelope output level. This is very handy as a voltage-controlled “envelope depth” when feeding the envelope to a filter, for instance. The… Read more »