Mutchus

Circuit showing a mobile phone jammer .Here i have used a fm transistor for making this circuit.Mobile phones are working in 450 MHz frequency .Here the transmitter generate almost equal to 450 MHz frequency there for the mobile phone does not identify the original signal but the signal range is very week so this circuit working in only 100 m range .This circuit working in only 450 Mhz .Do not give more than 3 V Circuit Diagram   Part List Component No: Value  Usage R1  100R   Emitter loading R2  39k    Base Biasing C1 15 pf   Frequency  Generating C2 4.7pf   Feedback C3  4.7pf   Feedback C4 102pf   Noise Reduce C5  1MF Coupling C6  2.2pf   Coupling C7     103pf    Decoupling  Q1  BF 494   Amplification L1  22nH  Frequency  Generating Applications * FM Transmission * TV Transmission * Remote Controlled T...

  This cell phone jammer operates at GSM800 frequency since most mobile phones use it to operate. So the selected VCO is a sweeping oscillator, which is very effective but may be hard to construct for the beginners without nice RF-testing equipment. As a noise source you can use 45MHz clock oscillator which is driving Local Oscillator port located on a mini-circuit mixer. There is also an impedance matching network for Local Oscillator signal to pass through it. It is used to equate impedances of the clock oscillator and the port of the mixer. RF input (which is this port of the mixer) connected to the first 800MHz cell phone antenna, and the RF output is sent to the mini-circuit amplifier. This amplifier increases the output power for 15-16dbm. The amplified signal then sent to the second cell phone antenna.  works All cell phones which use GSM800 have their transmitted and received frequencies always separated by 45MHz. So when the mobile phone tries to call it is blocked b...