Delay Timer !!!EMERGENCY!!!

[nwaste]

I have made a electronic door locker and opener and i need a delay timer for the opener for about 5-10 seconds. timer will be operated by the REGULAR SWITCH ON-OFF (NOT TASTER) which be pressed about 10 times a day, that mean i need delay timer which respond when i turn the switch ON it should power on relay and starts to counting, and when the time is up it should power off the relay and wait to i turn it off and on (same process, over and over...).
plEase hElp!!

P.S.
i made standard delay timer but it have to be starts by taster and realased immidietly! (only when the taster is realased he starts to count)

 

[waferstar]

I think you can use a 555 as the

 

[audioguru2]

Just use a coupling capacitor in series with the trigger switch so that it gives a short trigger pulse no matter how long you hold down the switch. If the 555 timer's pin 2's pull-up resistor is 10k then use a 0.1uF coupling cap. ;D

 

[nwaste]

This advice with the capacitor and 555; is that one circuit (capacitor in circuit with 555) or is that two independent circuit (or capacitor or 555). Dont laugh on my messages cuz my english is so bad especially this kind of it.

 

[waferstar]

Of course that is on one PCB circuit.



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