[Diy_efi] Time delay relay?

[Oolan Zimmer]

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>Where can I find some relays with time delay? I have seen plenty of adjustable
>.1-100s relays, up in the $50-$70 range. I need something simpler. A instant
>ON/fixed delay OFF relay with a delay of about 250-500ms.

It should be pretty easy to do this with a normal relay and a 555 timer for 
the delay circuit.  Set it up as a monostable and hook the resulting output 
up to a transistor that sinks current from the relay trigger to ground.

Do a google search for "555 timer" and you'll get lots of applications that 
include what you need.

http://www.uoguelph.ca/~antoon/gadgets/555/555.html

Oolan Zimmer
o_zimmer at soltec.net

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