6~60s high precision timer

Published:2011/4/20 22:10:00 Author:Nicole | Keyword: 6~60s timer | From:SeekIC

6~60s high precision timer. The timing time range of this circuit is 6~60s. When turning on switch AN, relay J1 pull-in, capacitance C1 is changed by R1 and potentiometer KP. When the voltage on C1 reaches 2/3 of power supply, IC output state is reversed, to complete the timing process. The function of voltage stabilizing diode VW2: when power voltage changes, it can keep the voltage steady; VW1 is used to stabilize the capacitance charging voltage, it can improve the precision. The timing time of circuit is T＝1.1(R1+KP)C1, to adjust KP will obtain any timing time between 6~60s. Voltage stabilizing diode VW1 can use 8V、1/2W,VW2 6V、1/2W.



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