Moving the inductor will be able to produce a large positive going spike, but the negative spike will still be limited to the supply voltage.Put the inductor in series with the drain of the transistor, not the source.
What's the purpose of the diode?
It does nothing as shown.
I built an engine monitor board for an experimental aircraft (using a Rotax 912 engine). I want to verify the tachometer "filter" circuit before I actually plug it into the aircraft. The circuit is supposed to limit the pulse to 5V. It works in steady state mode, but I want to verify it against high-voltage transients, both positive and negative.For what purpose? If it's for automotive use, then the negative-going pulse portions are probably ignored/suppressed, so there's little point in generating those.
Thanks for the circuit, it gave me some ideas.Hmmm...Is this what your looking for?
The output shown is at 100Hz(6000RPM) but also works at 8.33Hz(500RPM). I'm thinking the clock generator could be made using a NE555 timer chip.
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by Aaron Carman
by Jake Hertz
by Jake Hertz