Friday, March 7, 2014

Simple Circuit Schematic Cell Phone Signal Detector using IC CA3140

Eltronicschool. - Sometime we need to detect a spy cell phone or also for finding the lost cell phone when the phone is on vibrate alert. In this condition we need tools or device that can do this work effectively. So, in this time we want to give you simple electronic circuit schematic that will help you to give you very sensitive long distance cell phone detector circuit that can detect the mobile phone signals from 30 to 40 feet away.

Circuit Schematic

Figure 1. Cell Phone Signal Detector Circuit (Circuitdiagrams)

Component List
  1. Diode 1N34
  2. R 1M
  3. IC CA3140
  4. R 1K2
  5. R 470
  6. LED
  7. Q 2N4401
  8. Peizo Buzzer


Simple Circuit Schematic Cell Phone Signal Detector using IC CA3140 show in figure 1 above. Working of the circuit is simple, when we dial a number or send an SMS or MMS through our cell phone then our cell phone generate an RF signal to connect to its nearest cell phone tower, the two diodes shown in the circuit detects these RF signals which are amplified by the CA3140 IC. 

The output is fed to the transistor, which become switch on and activate the LED and the peizo buzzer. The operating voltage of the circuit is 9 to 12V DC but it can also be operated with 6 volt DC.  (

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