We found this circuit in a Radio Electronics from July 1968. The circuit generates rectangular pulses with an amplitude given by the supply voltage.
This basic configuration can be found in a lot of articles on this site. In this case, the relay...
This circuit is from American documentation from the 1980s. The transistors are general purpose...
The circuit is simple, as it uses only one transistor and a relay that can be MC2RC1 or MC2RC2,...