Hi Brooke, I am familiar with the Jim Williams app note, but I felt the pulse shape was somewhat lousy (based on the pictures that came with the article) due to the very small cap on the collector, OK to calibrate or evaluate a fast scope, I guess, but too far from a square wave to be able to visually observe and analyze reflections (at least from my perspective). Due to my ignorance of the avalanche effect, I did not think of mating this with a delay line. It seems the Zetex app note with a delay line can make decent square pulses, I have to try that. I have made high power pulse generators with delay lines a long time ago (radar modulators), it's been so long I had forgotten...
Didier Brooke Clarke wrote: > Hi Didiere: > > There's also an app note at Linear Technology for making pulses so fast > they are used to calibrate sampling scopes. > > Some years ago I made a very simple circuit that pulses a LED with many > amps (very short time) based on a transistor going into avalanche. > > Have Fun, > > Brooke Clarke > _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts