Found in Signalite documentation from the 1960s, this circuit generates ladder pulses. The circuit generates 3 steps and below 40 V of power, it works as a frequency divider.
With a unijunction transistor and a tunnel diode it is possible to obtain rise times of 1 ns with...
The adjustment of the maximum load voltage is made in the trimpot. The circuit is from 1994...
This circuit from a Radio Electronics from February 1976 activates the relay in two different ways...