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 power source can supply currents in the range of 100 mA to 1 A, depending on the transformer and the...
This 5 V regulator has a low voltage drop and can supply currents up to 5 A. The circuit is from...
The circuit of the figure allows to implement a multimeter of high sensitivity or even to use a...