The simple electric water tag circuit

Published:2011/7/2 3:01:00 Author:Borg | Keyword: electric water tag | From:SeekIC

1.working principle The circuit is shown in the figure. PC is a photoelectric coupler, whose feature is that the input and output is fully separated, so it is safe. S is the key switch of step type. The 220V mains is half-wave rectified by the diode D, filtered by capacitor C, and then distributed by R4 and R5, finally, it becomes an output DC voltage of about 10V which is added on the C pole of the triode in the PC. Usually, S is opened, the LED in the PC has no current and is not glowing, the light dependent triode is blocked, the transistor V is blocked.



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