This circuit is from a Radio Electronics from October 1963. The transistor is a power transistor of the time, and two transformers are used. The input has 10k impedance and is powered by 12 V.
This pulser, found in a 1979 publication, airs and closes the relay at a frequency determined by...
The XR2206 integrated circuit consists of a complete function generator. It is not a current...
Found in a September 1992 Radio Electronics magazine article, this circuit generates a pulse as...