منتدى الهندسة الكهربية

■ Make your very own laser burglar alarm
■ according to the image

■

Instrument:
1 photocell or LSR or LDR (as you call it) x1
2 5k variable resister x1
3 2n3904 transistor x1
4 1000uf 35v capacitor x3
5 speaker
6 9v battery x1
7 butt** cells x4
8 9v battery clip x1
9 most important of them all laser diode
10 vero board or circuit board

[URL="https://www.facebook.com/photo.php?fbid=579485198751154&set=a.579485145417826.1073741829.109596902406655&type=1&relevant_count=1"][IMG]https://fbcdn-sphotos-d-a.akamaihd.net/hphotos-ak-ash4/p480x480/485592_579485198751154_91862622_n.jpg[/IMG]
[/URL]