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Step 3Theremin hack!
To get control voltages from the theremin itself, we are going to tap into one of OpAmp pins. I have had great success with soldering to pin 5 of the LM13700n chip on the board. However, this affords us access to just the amplitude (volume) antenna. I will find how to access the frequency antenna (pitch) and add that to this instructable when I do.
To get solder to this pin, remove the board from the theremin and flip it over. Attached is a picture of exactly what pin to solder to. Run the wire under the board toward the left side.
The next step in the hack is to attach female header pins to the row of breakouts located near the top left corner of the board when you are looking at it face on, right-side up (see images). The female headers will let us prototype easily.
To get solder to this pin, remove the board from the theremin and flip it over. Attached is a picture of exactly what pin to solder to. Run the wire under the board toward the left side.
The next step in the hack is to attach female header pins to the row of breakouts located near the top left corner of the board when you are looking at it face on, right-side up (see images). The female headers will let us prototype easily.
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