Designing a timing device.

[darkwhite87]

Hi guys,

Background:

There are 2 relays, A and B that needs to be controlled (24V)

And a signal generating device that composes of a push button and an adjustable mechanism for timing delay between the 2 signals. (this is what I want to design)

Specification:

I want to design a device that, when I press the push button, relay A is activated for 1 second. Meanwhile, relay B is activated after a delay (of 150~300ms adjustable) after relay A is activated. Relay B also activates for 1 second.

Does anyone know if there are avaliable electronic products that will aid me for this purpose?
Such as an "adjustable delay timer" etc.

Cheers

 

[Proton Soup]

mcmaster.com has a ton of timing relays.

 

[darkwhite87]

Thanks Proton, but I looked through mcmaster, the timing relays are in the range of second~hours while I need a delay in the order of milliseconds.

Secondly I think I don't need a timing "relay". I want to control my relay with a time delay device.

 

[Proton Soup]

oh, yeah, milliseconds is pretty fast for what they have. i think i would start looking at designing something with 555/556 timers and some logic gates.

 

[dlgoff]

Here's a good place to start for using http://en.wikipedia.org/wiki/555_timer_IC" [Broken].