555 Alarm!

[Krumlink]

I wanted to build a 555 alarm that would rise in tone then drop back down for a cool effect. The rising tone would last about a second, then drop down to a low tone and build back up. It would give a sweet 555 effect. I am not quite sure how I would approach this, but I was thinking of using monostable 555's to set the second rising limit and a astable 555 for the frequency or tone. It would increase based on the monostable. Any tips?

 

[Krumlink]

Lol I have been listening to too much techno lately, so that is why I want a alarm

ROFL!!! SPARTAAAA GETS FUNKY!!!
https://www.youtube.com/watch?v=rZBA0SKmQy8&mode=related&search=

I connected up a huge speaker (20 Inch) and was PUMPIN!!!

 

[ericgibbs]

I wanted to build a 555 alarm that would rise in tone then drop back down for a cool effect. The rising tone would last about a second, then drop down to a low tone and build back up. It would give a sweet 555 effect. I am not quite sure how I would approach this, but I was thinking of using monostable 555's to set the second rising limit and a astable 555 for the frequency or tone. It would increase based on the monostable. Any tips?

hi,
Look here, a feast of 555's, enjoy..

 

[k7elp60]

I have found that if you want a rising and falling tone from a 555 you can use the charge and discharge voltage from the capacitor that is connected on pins 2 & 6. I have found it is best to us a voltage follower with an op amp to drive the tone circuit, so the charge and discharge of the capacitor is not affected by the other circuit.

 

[kchriste]

Something like this should work:
**broken link removed**
Or
**broken link removed**
Or just google for Lm555 siren.