Forgive me for asking again for help on a worn out subject such as countdown timers. Normally, I'd take on the challenge of design using the many pieces of information already posted, but time constraints force me to find a short cut.
I'm willing to pay for the design of a simple, portable, countdown timer, capable of milliseconds, that sounds a horn/beep when countdown timer reaches zero. I have placed a crude sketch and requirements list below. I suspect the design would be simple for some of the vets on this board, given other devices that have already been built. I'd be interested in your feedback/comments.
Cheers!
Ben
1.0 Countdown Timer Specs.pdf (197 KB)