Ok … so thinking about the etcher circuit, and after reading about potentiometers … it seems I’ve made a rookie mistake.
The legs on a potentiometer, when you stand the pot up and face the legs to you are:
- ground;
- input;
- output.
Since my circuit doesn’t need the ground, my previous design had the input and output the wrong way around.
The corrected design is as follows:
Not much difference from the previous iteration, but important!
Also, I’m going to simplify the design of the prototype, and not bother with the LED. The LED that I was using was an old component that I harvested from a previous project … and I think that it is dead. When I get back to the inclusion of the LED for indicating power, I’ll use a nice fresh new LED, rather than rely on an old and unreliable component.
Tonight, I’ll de-solder the project and rewire it according to this new version of the design.
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