Krumlink
New Member
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?