General Electric suggests this circuit in an 80's documentation. The circuit makes use of PUTs that are not common components today. Note the timing components that may change.
Found in a 90s documentation, this circuit makes use of D1, a switching diode that is uncommon today....
July 2017 - Mouser Electronics announced the availability of Littelfuse's GEN2 series Schottky...
In the figure we have the way to implement a monostable with a comparator 139, 239 or 339. The...