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Wide Rage Timer

2017-12-22 07:02  
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Wide Rage Timer

Wide_rage_timer

??? ??????? ??????? ??? ?????????? ??????? ????????, ??? ??????? ????????, ?? ??????? ??? ??????????? ??? 1 ????? ??? 20 ????, ?? ????? ???????? ????????. ????? ??????????? ???? 12V ??? ???????, ?? IC1 [555], ??????? ?? ?????????? ??? ?????????? ?? ??????? ?? IC2 [4017]. ?? IC2 [4017] ??? IC3 [[4020] ?????? ??? ??????????? ?????? ???????? 81920, ?????? ? ?????? ??? IC3 [4020] ???? ?? ????? ?????? ?????? ??? ???????? ?? Q1 ?? ????????? ??. ?? ?? RV1 ?????????? ??? ?????????? ????? ?????? ???? ???????.

A wide rage auto turn OFF timer covering 1 minute to 20 hours in three ranges with S1. As soon as power is applied to the circuit the IC1 [555] starts to oscillate happily and feeds clock pulses to the IC2 [4017]. The IC2 [4017] and IC3 [4020] give a combined count rate of 81920 before the output of the IC3 [4020] goes high and turns Q1 on. With pot RV1 adjust the Time.

Part List

R1=2.2KohmC1=120nF 63V polyesterIC2=4017B
R2=39KohmC2=1.2uF 63V  polyesterIC3=4020B
R3=1MohmC3=100nF 63VQ1=BC214
R4=27KohmRV1=470Kohmpot.S1=2X3 SEL SWITCH
R5=12KohmD1-2=1N4001S2=Push button  no
R6=6.8KohmIC1=LM555RL1=12V >120ohmRelay

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