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.
This circuit retriggers when a new pulse arrives. It does this by discharging the capacitor. The...
This circuit was published in the December 1987 Radio Electronics magazine. It uses two 555s to...
This voltage regulator was obtained in the SGS manual of linear integrated circuits of 1982. The...