With this simple circuit it is possible to simulate a telephone line for carrying out repairs on telephone sets. The transformer must be 36 V and the diode can also be 1N4004.
Written in an article in Radio Electronics magazine in April 1987, this circuit triggers an alarm...
This circuit was found in the April 1993 Electronics Now magazine. With it, it is possible to...
This circuit was obtained in a1969 magazine. The magazine no longer exists, but the circuit can be...