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

Graham
Time Delay Relay
Saturday, May 02, 2009 1:28:56 AM
Hi All, How can i build a timer relay that will run for a prox 8min and then switch itself off. Then switch itself on once a button is pushed running the 8min timer again? This is a solar powered project that charges a batt and the batt will run a screen. Outdoors. Cheers in advance..
tim
Time Delay Relay
Monday, April 27, 2009 9:24:07 AM
hi sir, i'm an electronics student, my cousin and i are planning to make an automobile's horn with time delay, does this circuit work with it? thanks.
Nicolai
Time Delay Relay
Friday, April 17, 2009 2:55:36 PM
Hi I build up this circuit and done a PCB design of it too and works me perfectly. I want to know a brief description of each component what is doing. My timer operates between 0 to 50seconds beacuse I changed the value of R1 and C1. I wish to hear from you thankyou. Regards Nicolai
priyanka
Time Delay Relay
Thursday, April 02, 2009 6:00:17 AM
Dear Sir, Is there any variations occurs in turn time delay, when we extend weightiest slowly i.e. form 4000 to 16000 ? Means when we measure turn on time delay with the help of oscilloscope, Is waveform diagram same for all model or they differ in their AC-DC slpoes?
Andy
Time Delay Relay
Wednesday, March 25, 2009 9:53:05 PM
Hi There, I live in a circa 1989 house that has a time-delay relay box. I'm not really sure why it's there, what the purpose is and if it's in good working order or not. I am not electrically inclined, but do know that it makes an almost continuous buzzing noise that isn't very loud, but definitely noticeable. Any hints you might be able to offer me? Thanks in advance!
Ricky
Time Delay Relay
Thursday, March 19, 2009 1:51:43 AM
The time you can count with this formula: T(s) = 1.1 * R1 * C1
Julian
Time Delay Relay
Wednesday, February 04, 2009 4:16:54 AM
Hi, What NPN transistor is needed in order to allow this circuit to be activated by the rain detector circuit on this website?
George Ndemwa
Time Delay Relay
Monday, December 08, 2008 8:32:57 AM
Am looking for a time delay relay that is energized by a small DC input (12V) and changes its normal state (NO) to the other state after the preset time is reached but remains at its normal state if a second DC input is fed before preset time is reached at the same time reseting the time to zero en counter stops.
Samer
Time Delay Relay
Monday, December 01, 2008 5:21:08 PM
Dear Sir Where can I add a resistance to chose the time between 0 to 9 second ? What do I need to change to make the circuit work with 24V DC? May I know the line , in and out and what the current value. To be connected to 24V pump so the pump will work for the range 0 -9 second and stop Thanks Samer
wapth
Time Delay Relay
Tuesday, November 18, 2008 5:23:26 AM
I need a relay timer to switch off after 6 hours. Basically I want to add in my battery charger.
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