Countdown timers

[LaserImage]

This has really nothing to do with CNC but I thought I would ask here anyway. I am looking for a couple of inexpensive countdown timers for an ac outlet that can be set for 0-120 seconds and another that can be set for 1-30 minutes.

If I had the exact part list and some instructions I would be happy to build it but I don't have the experience or knowledge to try and figure it out on my own. I had thought of using the timer from an old microwave but even "repurposing" that might be beyond my skill level.

I need to keep them very inexpensive, less than $15-$20 if possible.

any help?

thanks!
Gary

[Al_The_Man]

Look up 555 timers, you should find many, many. can be made for a few cents.
Al.

[keebler303]

I'll second Al's suggestion and add that a good drive circuit would be a ULN2003 and a relay with a 5VDC coil. This will take the 5V signal from the 555 timer and control a relay for a 110VAC outlet.

Matt

[LaserImage]

Thank you both for your replies. I did a little searching last night and found thousands of sites with kits and such using the 555 timer, I even found one completely assembled that doesn't need external power, just 110v - it powers the circuit as well as feeding the relay - $9.95!

Thanks!

Gary