Home Projects Miscellaneous Time Delay Relay

 

 

Time Delay Relay

source: http://www.aaroncake.net/

 

 

A time delay relay is a relay that stays on for a certain amount of time once activated. This time delay relay is made up of a simple adjustable timer circuit which controls the actual relay. The time is adjustable from 0 to about 20 seconds with the parts specified. The current capacity of the circuit is only limited by what kind of relay you decide to use.

 

Schematic

Schematic for Touch Switch

Parts:

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
MISC_______Board, Wire, Socket For U1

Notes:

1. R1 adjusts the on time.

2. You can use 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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