Electronic Circuits and Projects Forum

Hi everyone,

I need a simple transmitter and reciever that I can use to turn an LED on and off from across the room.

Can anyone inform me of one. I really don't care what the frequency is, just as long as it works well.

I'd really appreciate it!

D.J.

Why don't you buy 433MHZ transmitter and receiver. They're only about $8.50 a piece. Then use an encoder and decoder on the transmitter and receiver respectively.

If you build your own, you will probably be encountering problems w/ drift and what not.

Plus the transmitter and receiver are all surface mount, therefore extremely small.

http://www.rentron.com/index.html

Look under the rf remote control link, then find whatever transmitter will suit your needs. I think the one for $8.50 would be best though.
The place also sells encoders and decoders.

OR:
You could use infrared, like a TV remote. It would be cheaper.

Hi,

Thanks for the information. I think i've already been on that site, it's got alot of gadgets.

Their no fun in just buying. I want to learn as I build something I need. Hopefully, by seeing and building a working transmitter and reciever, I will be able to learn how they work, as well as have a neat gadget.

Thanks for the site, I might use that if I can't find the circuit.

D.J.

I using TX/RX 433 right now, but I've been looking for something like this too--it would be extremely useful. I don't care how long the band is.

I am using the same thing also in this project for my friend.
It only cost me $17.00 or a little more for the tx/rx.
I have used that for several projects of my own and other peoples.

One approach might be to build a simple transmitter for the AM broadcast band - and add an oscillator to it so that you transmit a tone when you push a button. There ought to be plenty of schematics available on-line or in hobby publications. Temporarily, the receiver can be any AM broadcast receiver. That way you can work on the transmit end until you are satisfied. Then move on to a simple receiver in similar fashion and add a 567 or similar tone decoder circuit. Doing both at once could prove to be frustrating - lack of success could be either one but you might not know which one. You could also do this at FM broadcast band frequencies. One caution - construction techniques matter more as the frequency goes up which might make the AM approach a little less troublesome.

Worth noting - there are a lot of educational kits out there for very little money, that result in a complete AM receiver (FM as well). Same thing for the transmit side. That might give you the learning you desire but eliminate some frustration - and the work of finding parts.

here is an easy way to transmit an audio tone. make yourself an oscillator and connect the output of it to an FM transmitter. Now make an FM receiver (I managed to pull this off on a superregen)

if you want LED output, then connect a stereo VU meter from talkingelectronics.com to the speaker output. You might need to increase the resistance.

HI,

Thanks for the help everyone!

I'll try all those idea's as soon as I get a chance.

Thanks again,

D.J.

This website

http://www.linxtechnologies.com/