Key ringer

Thread Starter


Joined Nov 10, 2011
I'm an engineering student .I'm trying to built a key ringer (which can be attached to the key as key chain so that it can be easily found out with the help of the beep sound when misplaced). I know its available in the market but wanted to make one of my own.i figured it out that it should have a RF transmitter receiver with a beeper attached tot he receiver ,but dunno really where to start.If u could give the necessary circuits that would be really helpful.


Joined Sep 30, 2009
One problem I see with something like this... How do you keep track of the "finding" device? The keys are used all the time, and if you can loose them how do you not loose the tracker that you seldom use? :)