o.k., so now i have a timer that will let me adjust between 1 minute and 23 hours and 59 minutes. but now... when the timer turns off, i need to ring an alarm, a loud and annoying alarm such as an old fire drill alarm or to signal an alarm that can be tied into the intercom system at the business. any ideas?????
timer question
Apr 08, 2005
4 Replies
The simple way is to use a relay with change over contacts. Feed the coil off the timeswitch, and when it switches off it makes a connection between the common and normally closed contacts on the relay.
*Your kid may be an honours student, but you're still an idiot.
Dave Plowman dave@davenoise.co.uk London SW
To e-mail, change noise into sound.
23
tied
Connect it to the NC contacts.
N
"scott canale" wrote in news:oVD5e.16652$ snipped-for-privacy@newssvr19.news.prodigy.com:
Your timer should have 2 sets of contacts; N.O. (Normally Open), and N.C. (Normally Closed). Those contacts simply act as a switch. Connect to the N.O. contacts, so that when the timer changes state it will close, thus turning on whichever circuit you may be connected to.
Travis
You mean NC. NC are closed after the timer runs out.
N
Join the Discussion
Have something to add? Share your thoughts — no account required.
Didn't find your answer?
Ask the community — no account required