A portable CMOS synthesizer based on the CD40106.
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As you can see from the gallery and the YouTube video, this is finished and working. I edited the components list to show the capacitor values I decided on.
Design circuit with the enclosure in mind.
Find the most appealing capacitor values.
Sure, this is an extremely lo-fi synth. But it might as well be as appealing to play as possible. I have three sizes of LDRs, so it's worth experimenting with capacitors to find pleasing frequency ranges.
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Oh, that is awesome. I have something else in mind for the immediate future, but maybe I'll give this a go after.
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I've been searching a while for this link: http://makezine.com/projects/make-33/optical-tremolo-box/ - I wonder if it is possible to make a (polyphonic) melody combining this with your box.