5 To 30 Minute Timer Circuit


This is so useful circuit because by using this circuit you can operate some thing with the delay of 5 min to 30 min.don't use NE555 here because the value of transistors it will not work here.





Parts


IC1: 7555

B1: 9V

C1: 33uF CAP

Q1: BC109C NPN

D1: 1N4004 DIODE

C2: 100n CAP

Relay 9 volt coil with c/o contact

S1: On/Off

S2: Start

S3: Range

R6,R5,R4,R3,R2,R1: 8.2M RESISTOR

R8: 100k RESISTOR

R7: 4.7k RESISTOR

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