The relay pulling-in precaution circuit in low voltages

Published:2011/7/8 0:17:00 Author:Seven | Keyword: relay, pulling-in precaution, low voltages | From:SeekIC

Working principle: see as the figure, V1 is a single knot transistor BT33C, which consists of the relaxation oscillator with R1, R2, R3 and C1, SCR is the single-way SCR, after AN1 is pressed, the circuit is passable, the SCR is not conducting without trigger voltage, the relay J is not working, the power supply charges C2 quickly and makes its voltage close to it(Vcc-VD1 voltage drops). At the same time, the power supply is charging C1 with the help of C1. In seconds, the voltage of C1 reaches the trigger voltage of V1, so C1 is discharging through V1.



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