Pulse counting circuit using capacitor - has capacitor discharging through thyristor which has negative ignition voltage, and system includes LED

摘要

The capacitor is discharged through a LED. The LED is optically coupled with a phototransistor. Each pulse is collected from the wire (1) which carries it through a high impedance (3), and the capacitor (4) is charged by a part of the pulse energy. It is discharged at the pulse end by the thyristor (6) through the LED. (9) during a time a fraction of the pulse duration. Signal generated in the phototransistor (10) is applied to an evaluation device.