Dialling pulse signal generator - has RC timing circuit with large resistor and small capacitor to reduce vol.

摘要

The dialling pulse generator is such that its RC timing circuit has a large resistor and a small capacitor to reduce vol. The input (ES) of the control circuit is connected via a decoupling diode (G1), a resistor (R1) and a switch (k) to the output controlling a relay (R). The timing capacitor (C1) is coupled to the collector of a second transistor (T2) following the first transistor (T1).