Circuit shown here can be used to jam FM radios in its vicinity. The circuit is nothing but a classic single transistor oscillator operating in the VHF region. Working principle of the circuit is very simple and straight forward. Powerful VHF oscillations from the circuit will interfere with the FM signals to nullify it. Jammer circuits like this
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are illegal in many countries and you must assemble this circuit on your own responsibility. This circuit is intended only for fun and i request you not to misuse it. I built it and it works like a charm! To increase power I have to change the 2N2222 with a 2N2219 and replace the power source with a 12V one And regarding the power, in a few words, how can I calculate the emitted power I`d like to ask something about the capacitors. C4 is an electrolytic (polarized) capacitor and it must be installed the proper way, but what about C3 and C2 Can they be ceramic (without any concern for polarization) Also, I couldn`t find a 6pF for C2. Is 6. 8pF OK ok, I built this on breadboard and it works. I just used a coil a made about a month ago for another schema 16AWG 100 turns on 20 mm diameter plastic tube. How you do the coil doesn`t seem to matter much because you set the frequency from the capacitor. Hi, if I calculate the values for L and C in order for this circuit to jam frequencies in SHF (GHz) will it do it or do I have to change some other component Can the transistor sustain a frequency of say 3GHz Seetharaman, this jammer circuit will work, but will face one problem, the human body capacitance will damped the oscillation in the tank circuit and it can affect the frequency stability. How do i connect crystal to stabilise the frequency. Please help me if you connect a crystal to the circuit then what ever the crystals...
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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