Many files optional timer circuit

Published:2011/6/28 4:07:00 Author:Fiona | Keyword: Many files optional timer | From:SeekIC

SBl is the start switch, sB2 is the stop switch. When you press the start switch SB1, the DC power supply charges the capacitor c3 through R2, the potential of integrated operational amplifier A phase input 3 is higher than the potential of reverse phase input 2, A outputs a high potential to trigger the directional Triode Thyristor VS to make the V5 conduct.AC power adds to electricity load through VS,timing power supply begins.After the release of SB1,C3 discharges by the A phase input,the length of discharging time depends on the c3's capacity,the resistance of resistors R6-R9 and the discretion of A reverse end (2) potential.



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