Time Delay Relay II

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jawaharlal@excite.com 248,168 6 39
When activated by pressing a button, this time delay relay will activate a load after a specified amount of time. This time is adjustable to whatever you want simply by changing the value of a resistor and/or capacitor. The current capacity of the circuit is only limited by what kind of relay you decide to use.


Schematic for Time Delay Relay


Total Qty.
C11See Notes
R11See Notes
D111N914 Diode
U114011 CMOS NAND Gate IC
K116V Relay
S11Normally Open Push Button Switch
MISC1Board, Wire, Socket For U1


  1. Email jawaharlal@excite.com with comments, questions, etc.
  2. To calculate the time delay, use the equation R1 * C1 * 0.85=T, where R1 is the value of R1 in Ohms, C1 is the value of C1 in uF, and T is the time delay in seconds.
  3. S1 may be replaced with an NPN transistor so the circuit can be triggered by a computer, other circuits, etc.
  4. Most any 6V relay will work for K1. If you use a large relay, you my need to add a transistor to the output of the circuit in order to drive the larger load.

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Add A Comment

Barry R
Time Delay Relay II
Friday, August 23, 2013 3:26:14 PM
I am using a Digital Safe and when the circuit is activated the output pullsdown a 6 volt solenoid - Problem is the output pulse is only 1 second - Needs to be 6 or 7 seconds (Power supply is 6 volts and output to solenoid is 6 volts) Circuits I have viewed seem to require 12 volts.
2 second on and 2 minutes off countinious working timer
Friday, May 06, 2011 7:38:39 AM
Dear Sir, I want to curcuit for 2 sec on and 2 min off time contionuesly working type curcuit. please help me. very urgent. tks ahmed.

(Editor's notes: See the 556 timer IC datasheet.)

Time Delay Relay II
Sunday, April 10, 2011 10:48:15 PM
hello i need a time delay relay for 8 hours.(12 v DC or 230 v AC) when ever power on a relay switch on after 8 hours i hop you can help me thank you
Time Delay Relay II
Friday, February 04, 2011 9:12:44 AM
not working. something is wrong with wirings. delay is 2 s. and cnaging capacity of r and C makes no changes on interwal.
2 second on and 3minutes off countinious working timer
Sunday, May 23, 2010 10:50:31 PM
Dear Sir, I want to curcuit for 2sec on and 3 min off time contionuesly working type curcuit. please help me. very urgent. tks Layanal
Time Delay Relay II
Monday, April 06, 2009 12:52:52 AM
Your Note # 2 above reads 2, To calculate the time delay, use the equation R1 * C1 * 0.85=T, where R1 is the value of R1 in Ohms, C1 is the value of C1 in uF, and T is the time delay in seconds. Shouldn't that read C1 in farads?
CK Ong
Time Delay Relay II
Monday, February 09, 2009 11:40:23 AM
Hi there, I'm a 3rd year student looking to build a simple variable delay circuit to delay continuous pulses to LEDs from an arbitary waveform generator. I'm wondering if this design is feasible for delays in the range of about 100 nanosecond to 10s of microsecond? Please advice, thanks. Best Regards, CK Ong
Time Delay Relay II
Saturday, November 15, 2008 10:53:48 AM
Following your notes, I put R-1 = 50 ohm and C-1 = 10 microFarad to get timer on about 7 minutes after connecting toggle S-1 ( 50x10x0.85 = 425 seconds, equal to 7 minutes plus). With toggle S-1 still connected, I'm waiting my 6 volt relay on. But after 20 minutes there's nothing happened .... May I have your kind advice for such problem ... shall I check certain point in that circuit ? Thanks so much for your kind attention. Robin - Jakarta
Patick S kennedy
Time Delay Relay II
Friday, October 31, 2008 11:53:31 AM
I'm looking for a timmer or timing circuit for a start of day/break/lunch/end of day bell.What is needed is a timmer that will ring the bell at the start of a period and ring again at the end of the period.The bell system already exsists and the owner does not want to replace it. Thank You Patrick S Kennedy Natco Industries West Warwick RI
Time Delay Relay II
Monday, October 27, 2008 11:38:18 AM
I am building a component that needs to activate a 12vdc 2amp solenoid for 2 or 3 seconds after a trigger switch has sent a signal. The trigger switch is human activated and will not stay open for the full 2 or 3 seconds. Is there a simple circuit for this operation that you know of?
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