Relaytimer ?

[Randy38]

I'm working on a project with this Relaytimer.I,ve got it set for a
6 second delay to activate my project.

The problem is (S1-switch/ on the schematic)
I want to say push the button and release it and it will delay 6
seconds before acvtivating.Got that part done.But i wont to be able
to push the button and release then the 6 second count starts.If
pushed again before the 6 second is up it needs to reset.And wait
for the second release to start the count down again.

What do i need here.Another switching device or ??
Thanks for any ideas :)

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.


Part Total Qty. Description Substitutions
C1 1 See Notes
R1 1 See Notes
D1 1 1N914 Diode
U1 1 4011 CMOS NAND Gate IC
K1 1 6V Relay
S1 1 Normally Open Push Button Switch
MISC 1 Board, Wire, Socket For U1


Notes:

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.

[audioguru]

Hi Randy,
Welcome to our forum.
You need to wire the 3 unused gates in the 4011 as a flip-flop that has a single input from your switch for toggling. Search Google for Flip-flop Circuit and you'll probably find a circuit.

[Randy38]

Thanks, I'm on my lunch break right now.I'll check it out
tonight.
Thanks again. ;D

[hotwaterwizard]

My timer would do the job.

http://groups.msn.com/ElectronicsHobby/shoebox.msnw?action=ShowPhoto&PhotoID=2

[Guest Alun]

Randy38,

Is this what you want?

Press a button and the relay comes on for 6 seconds, press the button again before the time has elapsed and the relay will turn off.

If is the case I recomend the folowing circuit:

Delay = 1.1RC