This is a RF jammer designed for the U.S. 800 MHz cellular phone band (870-895 MHz). This works by generating an overwhelming sweeping RF carrier on the cell phone handset's operating frequency range. Circuit Operation An Exar XR2206 Multi-purpose Generator is going to function as the tri...
INSTALLATION SUGGESTIONS: Solder the components on a general purpose PCB and keep the entire assembly in a plastic casing. Make sure to solder the relay on small PCB piece and keep the relay away from the circuit in the same plastic casing (as it switches mains AC). Connect the circuit to...
Having Gain of 20 The speaker used is a 2 watt, 8 Ohms type. The input at Vin may be fed from any audio source such as a cell phone headphone socket, a CD/DVD player RCA L or R socket or any other similar source. The pin Vs should be connected to +12V DC supply from an AC...
On opening the cover of the remote bell receiver unit, the following things may be traced out for commencing the modding process: You will find a small speaker connected via a couple of wires which terminate from the circuit board of the unit. Just cut-of the wires from the speaker, remov...