PowerTig 185 Micro Initial Fire Up!!

[unixgeek]

While sitting in the car for class I came up with this. Im going to have to test and run some calcs to see if its going to mess with the linearity of the pedal signal. If it doesnt or not badly then we're all good. If it does...well back to the drawing board.

Essentially what Im going to try is to cut the sweep of the pot to only hit 11k to 0k during a full sweep, then zero shift it so it runs 22 to 11k. The diode on there is to keep the "secondary" circuit from flowing because both are connected at all times. The diode allows the switch to have control over circuit selection otherwise the parallel res would always leak in. This was how I figured to do this whole getup with just a single switch on the outside of the pedal. If anyone has ideas Id love to confer. Picking up a micro soon and I love to tinker.

Disclaimer: IANA Electrical Engineer, only a EE student.

I was thinking about this and decided to model a few different resistance values when the pedal goes from 22K Ohms to 0K Ohms. You'll also have to be careful with the use of that diode considering you'll have to overcome the forward voltage associated with it (usually 0.3V to 0.7V) and that will definitely affect the voltage drop across the resistive circuit. See the plot below for how different resistance values would affect the range of the output....