Mobile Scanner Circuit


Posted on Feb 4, 2014

A device to locate the mobile phone. It emits intermittent flashes and beeps to indicate the presence of an active mobile phone. The circuit becomes active even if the mobile phone is in silent mode. It can be used to detect mobile phone call in noisy environments. Range of the circuit is 15 cm. The circuit is basically an RF detector. Dur


Mobile Scanner Circuit
Click here to download the full size of the above Circuit.

ing the activation of mobile phone, strong RF field will be generated. The sensor coil L detects the RF signals and T1 amplifies the signals. The amplified signals are given to the clock input of IC1. CD 4017 is a Johnson decade counter IC with 10 outputs. Its clock input pin 14 is highly sensitive to RF pulses so that it is a very good choice for RF detection. Only two outputs (Q1 andQ2) of the IC are used while the Q3output is tied to the reset pin 15 so that IC will reset on every third pulse. This will repeat the activation of LED and Buzzer. When the sensor detects the RF signal, clock input of IC1 gets pulses and its output pins 2 and 4 becomes high and low alternately giving flashing lights and beeps. The coil used in the circuit is a ready made inductor. Buzzer used is a small piezo buzzer.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Two line intercom
Motorcycle Alarm schematic
Function Oscillator using 8083
Schematic Diagram 100W 2x LM3886 Audio Power Amplifier
ARCHITECTURES FOR VIDEO PROCESSING
Mini LOGGER V1.0 Block Diagram
80 milliwatt Improved 3 Transistor Audio Amp
tate ambient power module
Master/Slave Switch
Water Level Alert
Telephone control automatic lamp circuit 2



Top