This circuit was found in a Popular Electronics from the 80s. It is possible to control a relay from a video signal. The circuit was used in video recorders of the time.
Found in a Radio Electronics magazine from September 1958, this circuit has an LDR powered by the...
In the figure we have the simplest way to implement a power supply for a tunnel diode. The...
This circuit was found in a 90s Motorola documentation. The circuit uses two SCRs that must be...