Generally functions in areas where the use of a cellular device is prohibited such as military installments & ATC testing sites.In this case, the LM358N Operational Amplifier is applied to the sensor node. You can use a 5V – 9V battery to power up the circuit. 1 Schematic of LM358 N Op-amp shows Voltage Controlled Oscillator (VCO).
The op-amp IC amplifies the input signal & triggers the LED & the buzzer to operate, indicating the presence of cell phone signals in the surrounding area. When a call or SMS is sent from the cell the circuit antenna detects the RF signal through mutual induction & forwards a signal to the inverting input of the LM358 op-amp IC. This cell phone detector can sense the activity of any cellular device whilst transmitting. For a detailed description of pinout, dimension features, and specifications download the datasheet of LM358 Useful Stepsġ) Solder the output block connector & resistors on the PCB board.Ģ) Solder the 100nF Capacitors & the LED on the PCB board.ģ) Solder the 10K pot & the antenna on the PCB board.ĥ) After that tune the preset pot.
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