Quote:
Originally Posted by Jon1967us
Reposting some info from ARF here to save anyone else the trip:
A fast recovery silicon diode such as the 1N4087 that he used should work. I believe the 1N914 would also work.
The 1N4087 has a recovery time of a couple of nanoseconds which is plenty fast.
The selenium rectifiers had a fast recovery time because they had negligible charge storage. However, the capacitance should also be kept small which means a small contact area which in turns limits the current capability.
The 1N4007 has a recovery time of 30 microseconds. That's almost half a horizontal scan so that obviously wouldn't work. The 1N914 has a recovery time of 4 nsecs, so it should work.
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1N4007 spec sheet says 2 microseconds recovery time, so should work.
https://www.rhydolabz.com/components...de-p-2214.html
I thought 30 microseconds sounded suspect.