[time-nuts] Fast Rise/Fall Time Pulser

Leo Bodnar leo at leobodnar.com
Sat Oct 14 13:53:00 UTC 2017

Hi Andrew,

> From its creator's forum posts, it appears to be a high slew rate

It's not a high slew rate, it's a short risetime. There are better technologies if you are after high slewrate. Avalanche BJT pulser, for once.

> comparator,

It's not a comparator anymore, it's a laser diode driver for now.

>  that once "triggered" will pass the next pulse of an asynchronous 10 MHz square wave clock (2.5 ppm).

It's not triggered.  It runs at its own 10MHz pace and provides a copy (within few ns) of its pulse output at additional SMA connector for those who have sampling scopes that don't trigger off the main signal itself.

> The first version used a micro for setting the threshold voltage.

Micro never controlled the threshold voltage.  First version used micro's internal oscillator for pulse train but jitter was so excessive that the only way to use sampling scopes was through delay line.

>   The micro was removed in the following generation.

Micro is still there.

> It is for generating fast edges for equipment (bandwidth) testing, not for precision timing.

This one is spot on!

> Feel free to correct me if I'm wrong.  I was disappointed with the limited information I could dig-up.
> ~~
> Andrew E. Mileski

Sorry for your disappointment.  All the relevant information necessary for its use should be on the webpage.  I am not hiding anything.
You don't really need knowledge of intricacies of its operation to use it and I appreciate your frustration with lack of design details.
However, I am happy to answer any questions.

The pulser is so simple that its use is a three-step process:

1) plug USB in
2) plug pulser into BNC scope input
3) sorry, there is no step three


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