Delay lamp circuit using relay (6)

Published:2011/7/20 2:59:00 Author:zj | Keyword: Delay lamp circuit, using relay | From:SeekIC

As shown in the figure, delay duration depends mainly on the R and C1 discharge time constant. The magnification of transistor VT1 and VT2affects delay time. The beta is big, the delay time is relatively long. When VT1, VT2 beta ≥100, using data as shown in the figure, the lamp E can be lighted for about 10min each time pressing the switch.



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