Radio transmitter and Receiver

In summary: He found a schematic for an FM transmitter and is wondering how to design a receiver that can pick up the signal and activate the siren. There are some limitations with this approach, such as the limited range of the transmitter and the need to tune it to an open frequency. Another option suggested is to use an IR link instead. Additionally, it is recommended to try using a garage door opener system, which would provide more security against potential hackers. Ready wireless modules and a buffer relay could be used for this solution.
  • #1
Harmony
203
0
How can I use radio wave to turn on/off a siren? I think it is possible for me to design a radio signal through this schematic:
http://www.aaroncake.net/circuits/fmtrans.htm

The problem is, how do I design a receiver that can switch on a siren by receiving the radio signal?
 
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  • #2
You could use a cheap radio receiver, and just bandpass the audio output to look for the tone frequency that you would be transmitting.

The circuit you show is for a typical low-power, unlicensed radio transmitter. The range of these transmitters is about 10m-20m, so don't expect too much. You also have to tune them to an open station frequency, so if you are in a highly-populated area with lots of FM radio stations, you will have trouble finding an open frequency.

You might consider using an IR link instead of FM. You could start with a kit, like the one in the lower right corner of this page:

http://www.transeltech.com/kits/kits1.html [Broken]
 
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  • #3
Try a garage door opener system

Try using a garage door opener system.
Two reasons.
1-you need a transmitter on a set frequency that trans mits a code
2-you need a receiver that receives a set frequency that needs a code to turn the power on.
Instead of the door opening and closing you could have the sireen latch on or off and the security of any hacker reduced.
good luck
 
  • #4
you would get ready wireless modules from Link Technologies they make ready modules you can further connect a buffer relay to switch on / off the siren

Rick
 
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What is a radio transmitter and receiver?

A radio transmitter and receiver are electronic devices that work together to transmit and receive information wirelessly through radio waves. The transmitter converts the information into radio waves, which are then picked up by the receiver and converted back into the original form.

How does a radio transmitter and receiver work?

A radio transmitter works by converting an electrical signal into a radio wave using a process called modulation. The radio waves travel through the air and are picked up by the receiver, which then demodulates the signal and converts it back into its original form.

What are the components of a radio transmitter and receiver?

The main components of a radio transmitter include a power source, an oscillator, a modulator, and an antenna. The components of a receiver include an antenna, a demodulator, an amplifier, and a speaker or other output device.

What are the different types of radio transmitters and receivers?

There are various types of radio transmitters and receivers, including AM (amplitude modulation) and FM (frequency modulation) transmitters and receivers. There are also digital transmitters and receivers, which use digital signals instead of analog signals.

What are the uses of radio transmitters and receivers?

Radio transmitters and receivers are used in a wide range of applications, including radio broadcasting, wireless communication systems, radar systems, and remote control devices. They are also used in medical devices, such as MRI machines, and in navigation systems, such as GPS.

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