White Noise Source

Posted by & filed under Noise, Projects, Synth DIY.

A pure white audio noise generator using an 8 pin PIC 12F675 This pages describes a simple digital noise source that produces pure white noise over the whole audio band – out to more than 40Khz, in fact. With filtering, you can derive pink noise and other colours. The circuit diagram included below was developed from the famous Polyfusion noise generator, and can produce white, pink and infra-red (low frequency) noise. The noise generator 12F675 PIC microprocessor uses a dual… 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 »

Voltage Controlled LFO (VCLFO 9D)

Posted by & filed under Projects, Synth DIY.

This voltage-controlled LFO is based on the PIC 16F684, which is a pretty basic chip. Nonetheless, this LFO has more features than your average LFO. For a start, it can produce 7 basic waveforms, and also includes a noise source. It can also morph its waveforms under CV control, well beyond basic PWM. There is an optional sample-and-hold module that can sample whatever is selected, the current waveform or the noise source. The LFO frequency, waveform selection, waveform distortion, and… Read more »