Circuit arrangement for switching impulse indicator with step motor in front of counter remote speech direction changes part am using purely directions

摘要

The telephone charge meter has a stepping motor excited by the telephonic speech current and independently of the polarity of this current. The motor drives a mechanical counter. The meter remains connected for a limited period only after use of the telephone. It has an electric motor with two windings (1, 2) in series-opposition or in series-addition with a diode (D) and a resistor (R). The meter also has a first capacitor (C) in parallel with the second motor winding to give dephasing with respect to the first motor winding, a second capacitor (C2), Zener diodes (D2, D3) and a full-wave rectifier (D4). The first half-step of the motor is provided by excitation of the first motor winding and by reaction of the second motor winding. The second half-step of the motor is excited from the Zener diodes, the second capacitor and the full-wave rectifier.