t0m
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I made a HF pedal for my welder with an illuminated footswitch. I wired it up by trial and error, and it sort of works, but I don't know why!
The foot switch makes a circuit for a secondary output primary coil which energizes a spark gap oscillator that generates high frequency bursts of high voltage to help start the arc. The LED lights up when the HF oscillation comes on, even though it is on an open circuit. My best guess is that the cable to the pedal is acting as an aerial and picking up electrical noise that is driving the LED.
This blog post gives more details. Any ideas?
https://smokedprojects.blogspot.com/2013/05/welder-rehab-foot-switch.html
The foot switch makes a circuit for a secondary output primary coil which energizes a spark gap oscillator that generates high frequency bursts of high voltage to help start the arc. The LED lights up when the HF oscillation comes on, even though it is on an open circuit. My best guess is that the cable to the pedal is acting as an aerial and picking up electrical noise that is driving the LED.
This blog post gives more details. Any ideas?
https://smokedprojects.blogspot.com/2013/05/welder-rehab-foot-switch.html
