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.
This circuit found on a William Sheets can be used with a headphone or external amplifier. The...
In the figure we have the circuit of a complete audio generator using the 741. The circuit was found...
This monostable multivibrator with signals in phase opposition was found in October 1986 Radio...