RF logic transmitter and receiver circuit?

[david90]

rf receiver circuit

I'm looking for a RF circuit that could transmit a logic 1 to receiver that then would activate a relay. The range between the trans. and receiv. can be about 3-10ft. Thanks for your help.

 

[flatulent]

transmitter and receiver circuit

The cheapest thing you can do is use an AM MW band receiver tuned to an empty frequency and an oscillator with a wire as the transmitter. Have a tone detector at the receiver output and turn the oscillator on and off at the tone frequency.

 

[IanP]

rf transmitter and receiver circuit

Try this link:
**broken link removed**
You can find there home-build rf transmitters and receivers ..

 

[jcding1980]

www.discover circuit.com

hi.

maybe u can try to look at this website link. a very good website to start with.
https://jap.hu/electronic/codec.html

regards

 

[truebs]

rf transmitter receiver circuit

Try www.discovercircuit.com and www.electronicstutorials.com .

 

[michael alon]

discovercircuit.com

you can use combination of HT11 by holtek chip as transmiter /reciver and transmiters from telecontrole or dadiometrix
it is under 10$ and you do not need to know nothing about radio

 

[smartsarath2003]

rf logic

The cheapest thing you can do is use an AM MW band receiver tuned to an empty frequency and an oscillator with a wire as the transmitter. Have a tone detector at the receiver output and turn the oscillator on and off at the tone frequency.

hai

I am also trying to implement a rf logic switch. Tone detector sujjested by u looks good for my application. I want to use a 555 timer as a transmitter.
How can I actually stop the tone detector activateed from another source close to my transmitter's frequency
Are there any other ways to stop this
Thanks

 

[artem]

www.discovercircuit.com

If there is no big obstacles you can use ultrasound or ir (3-10 ft). Those can spread via reflection assuming tx power will be strong enough .