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IR Jammer Circuit not working

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sneitzke38

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Hello I'm new to electronic circuits and have been trying everything to get this circuit to work. Any help would be greatly appreciated.

In this circuit I'm using:
(These are all in right place on schematic)

- 10k potentiometer
- A 470 ohm resistor
- A 1k ohm resistor
- A 560 ohm resistor
- A 47 ohm resistor in place of the 180 ohm
- 2 High Output IR Led
- A 555CN Timer
- 2 10nf capacitors
- A 2N3906 in place of BC557 (this may be wrong please comment if it is)
- 2 1N4148 diodes

I have attached the schematic which I used for this project.

That is what I have in this circuit if there are any problems or concerns with this please tell me Thank you

4.gif
 

1. Take diodes from base to + out and put 10kohm resistor instead.
-test now.

2. Change output circuit transistor pnp to npn type.
Start testing with 150 ohm resistor in collector, for protecting leds.
Look here.............

TV Remote Control Jammer

Note:
Remote controller carrier signal is usually about 38.5KHz.
In general, remote controls have carrier waves from 25KHz to 45KHz.
This carrier wave is used to distinguish pulses sent from the remote control
from other random and ambient light.
The receiver has a filter that will allow only frequencies near the carrier
frequency to be driven to the decoder.
 
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If it is 140-150 kHz - this is definitely too much. As kak111 wrote - most IR remote controllers work between 25 kHz and 50 kHz. I would recommend that you disassemble your working remote control and measure the frequency on the LED when you push some buttons. Then you know what frequency will be needed for the jammer.

I would recommend you also to look at some small micro-controllers, it is easy to build the jammer using a PIC micro as frequency divider / generator to drive the LEDs. Please have a look here :

"http://www.sourceboost.com/Products/BoostC/ExampleCode.html"

Article : "PIC12 Infra Red"
 
tsvetelin_velkov said:
If it is 140-150 kHz - this is definitely too much. As kak111 wrote - most IR remote controllers work between 25 kHz and 50 kHz. I would recommend that you disassemble your working remote control and measure the frequency on the LED when you push some buttons. Then you know what frequency will be needed for the jammer.

I would recommend you also to look at some small micro-controllers, it is easy to build the jammer using a PIC micro as frequency divider / generator to drive the LEDs. Please have a look here :

SourceBoost Technologies

Article PIC12 Infra Red .
Click to expand...

thank you i added a capacitor on pin 5 and got it down between 25-50 and i will try to find the frequency of my remote
 

The other work around is to stack your remote controller to transmit, i.e. stack one button like UP or DOWN when in menu and try changing the frequency of your jammer until the remote stops working. This is called "frequency sweep" :) .
 

I have tried this many times without it not sure why it doesnt work?
 

A remote comtrol receiver IC is able to suppress a continuous (CW) signal, as emitted by the said "jammer". The other point is, that standard RC transmitters are typically using higher output power and smaller beam angle.
 

FvM said:
A remote comtrol receiver IC is able to suppress a continuous (CW) signal, as emitted by the said "jammer". The other point is, that standard RC transmitters are typically using higher output power and smaller beam angle.
Click to expand...

So this will not work at all?
 

Yes TSOP is having such a property, ie it will not detect continuous wave (eg: in case of TSOP1738 it will not respond much to a 38KHz CW) ...

I think, you can try to introduce a discontinuity by connecting another astable MV to the reset pin (pin no 4) of the transmitter 555. Any way, I am not sure this will solve the problem, but you can try....
 
vinodstanur said:
Yes TSOP is having such a property, ie it will not detect continuous wave (eg: in case of TSOP1738 it will not respond much to a 38KHz CW) ...

I think, you can try to introduce a discontinuity by connecting another astable MV to the reset pin (pin no 4) of the transmitter 555. Any way, I am not sure this will solve the problem, but you can try....
Click to expand...

Im sorry but what is an astable MV? And how could i accomplish this?

Thank you!
 

a second multi vibrator to modulate the carier frequency ...

why don't you try with a micro-controller ? Check the link I posted, it is almost complete there.
 

OK I will look into that but how much is a micro-controller?
 

well, you can try with two 555 as FvM explained, you will need to add (mix) the two signals together in some way, I would use 74HC gate, AND logic will certainly do, but maybe some simplified schematic will also do ... sorry I don't have such, maybe someone can help?

micro-controllers are not expensive, even I read an article recently that I micro-controller like PIC12 is more convenient to be used as programmable timer than the old 555 ...

But this is another story :) .
 
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I think i may have a micro-controller would this code work with it or would I have to change it?
 

micro-controllers are not expensive, even I read an article recently that I micro-controller like PIC12 is more convenient to be used as programmable timer than the old 555 ...
Click to expand...
But I think, the above solution (microcontroller) may be really a tough one for those who are new to electronics...
 

I think you don't need to change the code as it transmits all the time when ENABLE signal is applied, well if your frequency is different than used in my project, you will need to adapt the divider.

However I agree - projects with micro-controllers might be too tough for beginners ... At least you need to have a PC and programmer before you can start. A C compiler and knowledge of C or assembly language will be also needed. But those projects are really gifty, you learn a lot from them.
 

Ya im not very sure about all of the programming to my mind the 555 seems like the easiest for my does anybody have a schematic of this 555 MV working

Thanks all!
 

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