Electronic Letter
Box:
Very sensitive
Uses timer IC
555
|
Automatically gives beep and
Light
|
Components:-
1) 9V battery with
snap
2)LDR
3)Variable resistance 100K
ohms
4)Resistance 3X470
ohms
5)LED 3 Pc
6)IC 555
7)Switch
Cost including
Shipping:
Item = Electronic
Letter Box
India = Rs:230/ $5.10
USD
Other
Country = $35.00
USD
