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Keytar/Theremin Project

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SkipMonkey

New Member
So this will be my first little project

im trying to build a theremin.

for those of you who dont know what it is Theremin - Wikipedia, the free encyclopedia, YouTube - The Legend of Zelda Theme on theremin


this is the schematic im using:

8779-ThereminSchematic.jpg


based on that, would i be right in saying that the 20k variable resistor in the bottom right would control volume?

And if you were to add a button right after the variable resistor, would that work like hitting a key on a keyboard to initiate the sound (press and hold the button and the sound starts, release the button and it stops)
 

audioguru

Well-Known Member
Most Helpful Member
This circuit has a digital square-wave output with the volume fixed by the supply voltage. It could feed a volume control that feeds a linear power amplifier circuit.

The 20k pot adjusts the frequency of its internal oscillator. When it is close to the frequency of the variable oscillator then the sound frequency is very low or is turned off.
 

SkipMonkey

New Member
so the pot is like a pitch adjust? ok thats usefull.

would i put the "strum" button right after the power supply then?
 

audioguru

Well-Known Member
Most Helpful Member
It will be tricky to design an on-off circuit that does not produce a loud POP when it is activated.
 
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