Wednesday, February 3, 2010

Time delay Relay circuit with IC555

Parts List
C1 10uf 16V Electrolytic Capacitor
C2 0.01uf Ceramic Disc Capacitor
R1 1 Meg Pot
R2 10 K 1/4 Watt Resistor
D1,D2 1N914 Diodes
U1 555 Timer IC
RELAY 9V Relay
S1 Normally Open Push Button Switch

1. We used R1 adjusts the on time.

2. You can get a different capacitor for C1 to change the maximum on time.
3. S1 is used to activate the timing cycle. S1 can be replaced by a NPN transistor so that the circuit may be triggered by a computer, other circuit, etc.


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555 Timer Circuit

Power Supply

Electronic Circuit Designer.