Time Delay Relay


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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

Part
Total Qty.
Description
Substitutions
R111 Meg Pot
R2110 K 1/4 Watt Resistor
C1110uf 25V Electrolytic Capacitor
C210.01uf Ceramic Disc Capacitor
D1,D221N914 Diodes
U11555 Timer IC
RELAY19V Relay
S111A 120V SPST Switch
MISC1Board, 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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Comments

Mr Robert Colson
Time Delay Relay
Sunday, May 11, 2008 6:08:13 AM
Dear Sir, Thanks for your time in gettinmg back to me. My Question - Will the relay turn off even if S1 remains closed ? If so, I then assume S1 needs to be opened for a time to enable another timing cycle to potentially begin ? Kind regards Rob rcolson@sky.com
George
Time Delay Relay
Tuesday, May 06, 2008 12:20:16 AM
I need a relay timer to swith on for about 1 minute then off for approximately 1 minute. Have 12 volt battery. Basically I want to reverse the polarity from the battery to 2 probes every 60 seconds (approx). Can you please help.
Josh
Time Delay Relay
Wednesday, April 30, 2008 10:05:03 PM
I need a circuit that, once power is removed delays for 3 seconds then applys power to a relay for 3-4 seconds then turns off. Can anyone help
Guillaume du Toit
Time Delay Relay
Tuesday, April 29, 2008 9:43:19 AM
Could you please tell me how to adjust the time to 10 or more minutes and if I can make a repetitive timer that can switch on and off in 'n cycle.
anonymous
Time Delay Relay
Thursday, April 24, 2008 4:29:26 PM
this is a great page because it hlep my to anderstand beter the time delays
Tawong
Time Delay Relay
Saturday, April 12, 2008 5:07:18 AM
time delay circuits should be triggered once voltage gets in, but there are cases where the voltage comes in as pulses before stabilizing.typical example is the dark detector circuits.
R.Thangaraj
Time Delay Relay
Tuesday, April 08, 2008 9:48:56 AM
in this relay if i want adjust up to 10mints what i want to do
Markymous
Time Delay Relay
Saturday, March 15, 2008 6:37:30 PM
I need a waterpoof time delay that is 12vdc and will allow 15 seconds before a 2 amp pump will come on.
S.T.RAHMAN
Time Delay Relay
Thursday, March 13, 2008 5:22:10 PM
We are looking time delay relay 0 to 10 second kindly send your same or replace with complete details, quote your best price fob. we will appreciate your quick response, Qty around 100 pcs. regards. S.T.Rahman Marketing manager Makman Trading Est p.o. box : 8 Riyadh : 11371 Saudi Arabia. Tel : +966 01 4726600 Fax : +966 01 2791079
wasif waheed
Time Delay Relay
Thursday, March 13, 2008 7:15:29 AM
How much time a "time delay relay" can delay.
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