[time-nuts] Fast risetime pulse generator

[David]

On Wed, 13 Apr 2016 00:03:03 -0500, you wrote:

>...
> 
>If you are building up something, you probably want a SRD (step
>recovery diode) or tunnel diode. But both may be hard to find and
>expensive these days.

Step recovery diodes are very similar in construction to varactor
diodes so the later can be used in step recovery applications with
qualification.

I have also seen the 1N4148 used as a step recovery diode when driven
by an avalanche pulser but I do not know if it was qualified.