jeevan772006 Posted July 28, 2006 Report Share Posted July 28, 2006 hi friends i had taken a project of remote jammer from one site.I had made one circuit of that too .But that is not workig.Is that circuit is right i want to know.so please give me your suggestion as soon as possible i am providing you that web site providing that circuit. http://www.electronic-circuits-diagrams.com/fun_circuits.shtmlthank you Quote Link to comment Share on other sites More sharing options...
jeevan772006 Posted August 22, 2006 Author Report Share Posted August 22, 2006 hi Quote Link to comment Share on other sites More sharing options...
jeevan772006 Posted August 22, 2006 Author Report Share Posted August 22, 2006 hi Quote Link to comment Share on other sites More sharing options...
Theatronics Posted August 22, 2006 Report Share Posted August 22, 2006 The circuit produces a series of flashes in the IR range.Most TV remotes blink an led on and off at 38-40 thousand flashes per second.This high speed flashing is then switched on and off (Modulated) to send the actual data.The problem may be that the detector on your devices is very sensitive and is able to pick out the data even though you are sending a different IR signal. Think of it like radio.If the transmitter and receiver are both tuned, outside signals will have very little influence over them. The only way to JAM a signal is to overpower it so that the receiver can not detect the original signal, or to match the signal carrier and send a interfering series of pulses.I'd suggest you try a 556 chip, it has 2 555's in it.Set one up to create a 39khz signal and set the other one up to produce a 1khz signal.Use the output of the 1khz signal to (Modulate) the 39khz signal.Imagine you are in a loud stadium during an exciting game.If your friend beside you tries to talk while the crowd is yelling loudly you may not be able to hear him at all. This is the method of simply overpowering the receiver with blanket noise. Later during a quiet moment you have 2 friends who both try to say something at the same time. You can’t understand them because their voices blend and make no sense. This is similar to what I am explaining.What your current circuit is doing is similar to you and your friend talking while a trumpet player holds a very long steady note. The note is easy to ignore because it sounds nothing like your friends voice and it is not loud enough to overpower his voice.In fact a single note would have to be a very powerful signal to interfere because the modulation helps the receiver pick out the most subtle signals from a sea of IR noise.Some equipment will even work in direct sunlight, now THAT is a noisy IR source.I am sure someone will post the Circuit Diagram.-Mike Quote Link to comment Share on other sites More sharing options...
audioguru Posted August 22, 2006 Report Share Posted August 22, 2006 The value of the 180 ohm resistor in the circuit limits the current in the IR LEDs to only 3mA. Try the circuit with 22 ohms instead.The unmarked pin on the 555 is its pin #7.Tune the frequency with the pot for the best results. Quote Link to comment Share on other sites More sharing options...
jeevan772006 Posted August 23, 2006 Author Report Share Posted August 23, 2006 dear friends thank you very much for your suggestion.do you think does your suggestion is right.i will try it and will send you the result.if you got some additional information then please do reply me.thank you Quote Link to comment Share on other sites More sharing options...
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