Here is a new project I'm working on - a pseudo-sine wave generator. It uses a 40106 CMOS to generate a square wave, using a B100K pot to control frequency. This is the clock-in to a 4017 decade counter. Each output of the decade counter goes through a different resistor, which all connect together to the output. There's an additional resistor between the output and ground -- this creates a voltage divider, between whichever of the 4017's outputs is active (which will be at 9V) and ground.
If I know what I'm doing, it should create a roughly sine waveform:
So, I designed a PCB and once I etch it and build, I'll be back with part 2...
Follow-up:
Doesn't seem to work quite right:( It definitely produces a complex waveform, with multiple frequency components. I haven't really tried much trouble-shooting, other than making sure the resistors aren't open or shorted. Wish I had an oscilloscope!
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