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Give it a few seconds to fire up. May have found a way to simulate it better, but this would require cutting the toroidal wrap in half to insert this capacitor from opamp.
So I've built this high frequency multivibrator on a bread board, it easily powers a piezoelectric speaker, the only missing piece here is the third winding of the sum of the primary and secondary coils (twice as many windings) around a toroidal, which I obviously can not simulate here, which sucks because I can't simulate my working circuit on here.
Also I've scoped (using an app and my phone) this circuit out at 19.8kHz in reality, but that doesn't translate to here either.
Any ideas on how I should go about this?
I'm going to upload a video of this circuit onto the G+ community in a few seconds.
These TIP120's get super hot during operation, need to address that issue, first attempt was two in parallel, works, for about a minute or two then they reach a steady temperature I do not like. This was fixed by repositioning the 242 Ohm resistor to now block some current to the coils, at this rate I don't need the parallel transistors.
Op amp circuitry used for output and final amplification of high frequency
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