This is a really simple project I did at work in my spare time (after hours). I was working in a lab and there were all sorts of components and machining tools at my disposal, so I decided to put together a circuit I had in mind for a while. I've been using the triangle wave generator as an oscillator with great success in the past, so I decided to put four of them together, each being controlled by a separate LDR (Light Dependent Resistor) for the frequency. This makes it light controlled. They all have the same base frequency (slightly offset due to component variations) but they are so sensitive that if you hold your hand over it just the right way, you can get a chord or some weird screaming sounds.
Do you have a layout for this? Its lovely!
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