Cell Phone detector using LM358

Circuit Diagram :

Requirements:

Lm358 ic x1
capacitors : 100nf or 0.1uf x 3
resistors  : 6.8 Mega ohm x3
                 1 k ohm   x1
Potentiometer or variable resistor  : 500 k ohms x1
Buzzer - optional x1
LED x1
Antenna x1
battery 9v  x1
and some connecting wires

Video

Police Lights using 555 timer ic and 4017 Ic

Circuit Diagram :

Components Required : 
NE555 IC : 1
IC4017B : 1
zener diodes IN4148 : 6 pieces needed
capacitor : 2.2 microF
Resistors : 470 ohms : 4
4.7 K ohms : 2
1k ohms : 1
22k ohms : 1
LED lights : Your wish red and blue
Battery 9v : 1
some wires needed :)

Watch video for working: