laser security

Discussion in 'The Projects Forum' started by laserboy1, Aug 1, 2009.

  1. laserboy1

    Thread Starter New Member

    Aug 1, 2009
    Hello, im begining to learn a little about electronics so i started with a project involving a laser security system, i already got the laserbeam working but I still need to get the reciever working, the laserbeam gets recieved by a photocell and would have to set off an alarm, i have the scheme here, it's in the video, the guy that explains will show the scheme. But i really don't understand it, I have all the components but i don't understand what i should do if i see a ground symbol. This is my first time so could someone explain how is am supposed to bring 3 cables out of baterry(see picture) while there are only 2. or just show me excactly how I should do it with all the wires shown. Many thanks for everyone who helps.