The frequency jammer works by creating interfering RF noise, centered around the 2. 45 GHz carrier. As the power associated with the noise increases, the signal to noise ratio for the wireless communication channel decreases. This increases the bit error rate until it becomes large enough for the wireless device to be no longer operable. The freque
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ncy jammer is designed around the voltage controlled oscillator, VCO, which creates the interfering RF signal. While VCO`s can be built using opamps, resistors and capacitors, the low cost, availability and reliability of prefabricated VCO`s make it optimum to just purchase the device. For our proof-of-concept design, we needed to create an interfering signal for the 2. 4 GHz band. We were able to find a VCO from Mini-circuits that met these requirements. The VCO, ZX95-2650, can be tuned from 2. 05 GHz to 2. 70 GHz and is already housed in a case with an SMA connector. The ZX95-2650 was a little more expensive than surface mount VCO`s, but fit within our budget and reduced the time we would need to design a Printed Circuit Board (PCB). The jammer works by applying a triangle wave to the input of the VCO. The voltage range of the triangle wave corresponds to an interfering frequency range of the VCO. Each prefabricated VCO will have a specific voltage range that corresponds to an interfering frequency range. In the case of the ZX95-2650, we decided that a voltage range of 9. 6 V to 12. 5 V would create the desired interfering signal for our project. According to the data sheet of the VCO, this corresponds to the VCO being swept from about 2. 38 GHz to 2. 5 GHz. It is necessary to sweep the VCO from slightly below the 2. 4 GHz band to slightly above 2. 4 GHz in order to ensure the desired jamming takes place. Also note that...
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
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