I'm planning a new rocket igniter, I want to incorporate an audible alert on starting the ignition timer.
Basically a momentary button is pressed to start a monostable 555, at the end of its time period it triggers a second monostable 555 to conduct to the igniter via a MOSFET.
The countdown period is 5s or so, but I don't want a 5s tone, just an audible 'chirp' or beep....

Can anyone suggest an easy way to do this??
I know I could do what I want by triggering a second pair of 555's off the output of the first one above, but seems a bit clunky....

Thanks
Lee

 

 

An electronic version of a chirping canary. Not tried. http://www.radiolocman.com/shem/schematics.html?di 62835.
It's not bringhing up full address- try typing it out in long hand- it's there.

 

Hello,

You could try an electronic canary circuit:
http://www.zen22142.zen.co.uk/Circuits/Music/canary.htm

Bertus

 

Thanks Gents....
You just have to know what to search for....
Might be easier to just use a 556 I think!

 

bertus, yours works better for same ckt.