Photo-Logic Multiplex

JingleJoe · Posted: Mon Sep 03, 2012 3:49 am Post subject: Photo-Logic Multiplex

This is my latest simple sound machine, works on a similar principle to my logic multiplex but with slightly altered functionality and greater depth of LFO control.
Schematics and photos are attached along with a sound demo Smile

It utilizes a 40106 schmitt inverter to make 3 light controlled oscillators with LDRs (Light Dependant Resistors) and 3 LFOs which just use pots. These are connected to a 4051 multiplexer connected as a programmable gate or "ANY" gate. I had a DIP switch in some old electronics which I used as the switches in the diagram below. Scavenged wood and metal were used too, for the box Smile

P.S. it is also for sale!

GDAL photo logic multiplex circuit diagram.png

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GDAL photo logic multiplex circuit diagram.png

DSCN08541.JPG

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DSCN08531.JPG

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sound demo 6 mins.mp3

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sound demo 6 mins.mp3

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Uncle Krunkus · Posted: Mon Oct 15, 2012 4:52 am Post subject:

Just saw this Joe.
That is one cool little artifact man! Cool

tjookum · Posted: Mon Oct 15, 2012 1:56 pm Post subject:

I love photocells for simple noise makers, cool idea to use it together with the 4051 for some rythmic variations. I really like your creations jinglejoe, cool stuff.