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Yet another installment of the diode recovery saga

Complete circuit:

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(Low level stuff is breadboarded, ampy stuff is soldered and tight.)

Bleh, two chips to make the double pulse waveform... oh well, a 555 is too slow. (I didn't even bother trying to test one, so I don't honestly know if it is. :-P ) CMOS is also finicky with high Z and ESD crappiness, but the circuit shown seems to work, so long as you don't get your parasites all over it (a touch's parasitic R and C, that is). The two video transistors do a reasonable job of amplifying the output for the ZTX dudes, which move the MOSFET gate by 10V in under 50ns (longer with load).

Output waveform is complementary of the generated pulses, plus some ringing. At the drain, the Lpulse rings as a result of flyback when the FET is off, while "output" (sans coupling capacitor) rings when the FET is on.

Waveforms:

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Tim

--
Deep Fryer: a very philosophical monk.
Website: http://webpages.charter.net/dawill/tmoranwms
Reply to
Tim Williams
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Derrg, CTRL+V and ENTER to paste a line at a time isn't easy when your fingers get slurred... I'm goin to sleep. ;o)

Drain waveform:

Gate (*gate*, not before the 10 ohm):

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Dunno what the ~40MHz ringing on the plus peak is... Easy to see miller C is more effective on turn-off, which it should be with such inductive loading.

Tim

--
Deep Fryer: a very philosophical monk.
Website: http://webpages.charter.net/dawill/tmoranwms
Reply to
Tim Williams

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