The pieces used to build the analog computer.
- 3 knobs that are 3d printed (https://www.thingiverse.com/thing:3460654)
- 3 potentiometers (Two 50 Ohm, One 1K Ohm)
- 2 springs
- 2 headphone jacks
- 1 SPDT switch
- 3 pringles lids or circles cut from clear plastic
- battery holder that is 3d printed (https://www.thingiverse.com/thing:3115171)
- a pencilbox :)
For space, I overlapped the 3 potentiometer gauges. Rather than 3d print needles, which might hit each other, I glued the plastic circles to the knobs and drew a line on it for the needle.
The face of the computer with the gauges was laminated and glued to wood. I thin added side walls to mount in the pencilbox. I also 3d printed a battery holder for AA batteries. Again this is wired for either the voltage or the audio input. The finished bottom looks like this.
And that's it! There's a lot to be said about the actual potentiometers used. The tolerance should be less than 5% in order to get fairly accurate results. Using 20% tolerance means that between the 3 pots, your error could be too large to be useful.
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