Square Earth Theory – audio slicer pedal update

Posted: December 6, 2012 in FX, Square Earth Theory
Tags: , , , , , , , , ,

Just a quick update on the SET audio slicer I’m developing.

The logic side of the circuit that is used to control the stuttering is all up and running well, but I’m still having trouble slicing the audio without introducing noise. I’ve removed the 4066 chip and redesigned the circuit to use a JFET as the switch. By having this in a shunt arrangement where the source and drain are biased to a reference voltage I can eliminate most of the popping, but there is still a little bit of ticking on the audio line. I’ve also tried using a LED and LDR to shunt the signal without allowing any noise from the oscillators, but it isn’t perfect either way. It may be that the noise is on the supply rail and I need to filter the supplies, but I’m not sure with very limited time to spend on it at the moment.

The controls will also have changed by the time this comes out. At present they stand at Rate A, Rate B pots, long/short range  toggle, A/AB toggle, and/or toggle.

Whatever happens, I have learnt a lot from this project, one being that nothing is as easy as it first seems!

  1. 0xdfx says:

    That is correct, you basically treat rate a as a tremolo (just with a very steep waveform) and then add in rate b to create patterns. You are a tad limited because the duty cycle isn’t modifiable (with the 4047s its 50%) but you can create some cool stutters with it. I tried doing a vid earlier but had to go out.

    To be honest this is a project better suited to a pic and digital logic, but I don’t know enough about it yet. Digitally this could be awesome, there is just so much more you could do in code than with analogue components.

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