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This VCO is actually based on the magnitude of current through the inductor. The Voltage control signal is directly proportional to the current threshold…. So the larger the control voltage, the larger the current it takes to cross the threshold. Also worth noting is there’s actually only one threshold here, so once it crosses that threshold, the circuit flips states pretty quickly as it attempts to drive the current back to where it was, but because it takes time for the current to dissipate through the inductor (as it try’s to resist changes due to the nature of inductors) the circuit oscillates as a result. The current itself is practically continuous through the inductor because of this; it really only varies by a slight degree, Yet the output is remarkably large and pretty much a perfect sine wave! Just imagine if there was also a lower threshold, forcing the current through the inductor to drop to near zero, (or an adjustable amount), before it rises back to the upper threshold; then the amount of change in current over time would be huge, meaning the output voltage would have to be crazy huge too!! Stay tuned, Version 2 is probably coming very soon!
Notes:
1. *Shake to start*, or wait a ridiculously long time.
2. The control voltage is the signal with the Red trace.
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