Yep, that is a good one. Thanks karesz
Here is a scan of the one I have, a friend built it and gave it to me last night, I tested the actual circuit last night and is working fine, I cant tell the exact shortest pulse width as I only have a slow usb scope, but it can go below 1 micro second as I could see it's effect on the system I need it for.
As it is shown, it is triggered from pin 3 of a 555 (the circuit in my earlier post will work fine as a trigger in the range of 1 Hz till 100KHz - Astable) you dont need to vary the pulse width of the 555 as a 50% duty cycle will work.
The attached circuit is the retrigable monostable using 74AS00, varying C and the variable R (between pins 3 and 4+5) will vary the pulse width, changing C will change the range, however, my friend used the SMD version of this IC and he advises that C and R would be as close to your printed circuit as possible.
The power source that I'm pulsing is a 60V/ 10A charging a 47000 mf capacitor bank and I think it is handling it fine till now.
PS: this circuit needs regulated 5V
For C: you can use a 47 pf capacitor, but then the circuit will be very sensitive for electric distortion/ interference, so a 100 pf is better for the lowest pulse width (10 ns).
Also, you can not use a selector to change capacitors in this part of the circuit (not like the 555), if you need more than one range, use jumpers to select a capacitor that fits your new range, you can use: 100 pf, 1 nf, 10 nf, 100 nf and 2.2 uf to get 10X range from one capacitor to the next.
For R: a 100 ohm + a 4.7 k ohm variable. the V Resistance must be a small one mounted as close as possible to the board (knob type will not work here), use a non metallic screw driver to vary it's value.