At 02:54 PM 4/7/03 -0700, William Chops Westfield wrote: >I've often wondered (ok, not THAT often) how to get a microcontoller to >generate a convincing "tick" or "tock" sound out of a speaker. Little >beeps are just ... inelegant, and simply driving the cone with DC seems >like it would be too short... The little 'BANG' simulator I built for some pyro FX guys several years back used a simple capacitive discharge scheme. Charge a small cap (1 uF? 10 uF?) to a relatively high voltage (several 9V batteries in series), then dump that charge into a little 4" speaker via MOSFET. Makes a *very* loud tick that can be heard over a large area. Batteries last for a long time - not quite shelf life but close. The gear comes back every couple of years for a checkup - I change the batteries just on spec. dwayne -- Dwayne Reid Trinity Electronics Systems Ltd Edmonton, AB, CANADA (780) 489-3199 voice (780) 487-6397 fax Celebrating 19 years of Engineering Innovation (1984 - 2003) .-. .-. .-. .-. .-. .-. .-. .-. .-. .- `-' `-' `-' `-' `-' `-' `-' `-' `-' Do NOT send unsolicited commercial email to this email address. This message neither grants consent to receive unsolicited commercial email nor is intended to solicit commercial email. -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics