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November 24, 2022

How To Make A Cell Phone Jammer Using A Transistor?

More and more mobile phones are used with the development of society. Despite the convenience, these mobile phones have brought us, there are situations where individuals tend to be affected by these devices, causing anxiety, so at some point, we try to block these signals. So in this project, we will study step by step “How to Make a Cell Phone Jammer Using a Single PNP Transistor and a Few Other Components”.

What is a Mobile Signal Jammer?

A mobile signal jammer is an electronic device that blocks the transmission of signals between a cell phone and a base station. The device is available at, and by using the same frequencies as cell phones, cell phone jammers create strong interference with communications between the caller and receiver. It can effectively block signal transmission from networks such as UMTS, 3G, CDMA, GSM and PHS.

The following is a specific production tutorial:

You will need the following parts to build this project.

S.No Component Value Qty
1) PNP transistor BF454 1
2) Ceramic Capacitors 1uF, 102pF, 15pF, 4.7pF, 5pF 8
3) Pushbutton – 1
4) Enameled Copper wires – 3 meters
5) Inductor 22nH 1
6) Resistors 100K, 39K 2
7) Soldering Iron 45W-65W 1
8) Soldering Wire with Flux – 1
9) DC Battery with clip 3.7V 1
10) Smartphone – 1
11) Veroboard – 1
12) Jumper Wires – As per ned

DIY Steps

1) Solder the BF494 transistor on the Vero board & solder a 22nH inductor to its collector pin.

2) Solder a 15nF capacitor on the collector of the BF494 to Vcc of the circuit.

3) Solder the two 4.7pF capacitors in parallel between collector & emitter of the transistor.

4) Solder a 39K Ohm resistor & a 102pF capacitor to the base of the transistor to VCC.

5) Solder a 1uF capacitor on base to collector of the transistor.

6) Solder a 100K resistor on the emitter of the transistor & two 5pF capacitors in series on Vcc to GND.

7) Connect a pushbutton with a 5pF capacitors to the +ve terminal of the DC Battery.

8) Connect a 3m coiled copper wire antenna to the 5pF capcitor.

9) Power up the circuit & test the circuit by pressing the pushbutton.


The working of this circuit is quite simple. The circuit generates a signal in the same frequency band as the cell phone signal, causing interference, resulting in a DoS (Denial of Service) attack; the jammer denies radio spectrum service to cell phone users within range of the jamming device.

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