This circuit is suggested by American documentation from 1970. It makes use of transistors of the time but can be implemented with modern equivalent transistors.
This circuit was found in an English magazine from 1978, but it is still current, just change the...
Found in Signalite documentation from the 1960s, this circuit generates ladder pulses. The circuit...
Using NPN transistors, this circuit activates a voltage relay according to the power supply. The...