Can someone suggest a (simple) RF transmitter & receiver cir

Z

zalzon

Guest
I would like to build a circuit where I can send a pulse and receive
it on another circuit a short distance away.

I'd click a button on the transmitter, it would light an LED.

And shortly thereafter, an LED would glow on the receiver.


Can anyone suggest a circuit for this.

I was about to build the transmitter (below) but the receiver looked
rather complicated. Anyone have something simple that works and I can
fiddle around with to learn ....or is this as simple as they come?

http://www.interq.or.jp/japan/se-inoue/e_pic6_8.htm

Thanks
 
zalzon wrote:
I would like to build a circuit where I can send a pulse and receive
it on another circuit a short distance away.

I'd click a button on the transmitter, it would light an LED.

And shortly thereafter, an LED would glow on the receiver.


Can anyone suggest a circuit for this.

I was about to build the transmitter (below) but the receiver looked
rather complicated. Anyone have something simple that works and I can
fiddle around with to learn ....or is this as simple as they come?

http://www.interq.or.jp/japan/se-inoue/e_pic6_8.htm
Click to expand...
It depends; what exactly do you want it to do? How many
channels, what range, what degree of interference rejection,
and so forth. If all you want is a lit LED, a PIC-controlled
FM XMTR-RCVR pair is indeed "rather complicated".

Try Googling for "simple rf" +project

which will give you lots of hobby-level stuff (and not a
few higher-level hits). Frinst go to:

http://www.qsl.net/a71a/circuits.htm

and click on the links that start with "Simple".

BTW in the site you gave, note the sections "Circuit
Explanation" in which the "complicated" circuits are broken
down into easier-to-understand blocks per my mention in
reply to your other post.

Mark L. Fergerson
 
I tried this one on for size.

"The Simplest RF Transmitter"
http://www.uoguelph.ca/~antoon/circ/rft1.htm

As both my breadboards were occupied with other projects, I decided to
just solder the thing onto a perf board. I then got my walkman and
switched it to FM trolling up and down the dial for a signal.
Nothing.

Thinking I may not have made enough turns on the coil, I redid it and
soldered it a second time. Still nothing!

One question.

The webpage mentions "Hookup wire" being used for the antenna and
"magnet wire" being used for the coil. What exactly are these types
of wires. I just used regular wire hoping it would work but obviously
it didn't.
 
On Mon, 05 Jan 2004 02:26:15 GMT, zalzon <zalzonishappy@zalll.com>
wrote:


The webpage mentions "Hookup wire" being used for the antenna and
"magnet wire" being used for the coil. What exactly are these types
of wires. I just used regular wire hoping it would work but obviously
it didn't.
Click to expand...

I suspect your "regular wire" would be "hoiokup wire" - hookup wire is
#22 or 24, solid or stranded copper wire with plastic insulation.

Magnet wire is solid wire with varnish insulation - the type of wire
used for winding transformers and other coils.



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Peter Bennett, VE7CEI
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zalzon wrote:
I tried this one on for size.

"The Simplest RF Transmitter"
http://www.uoguelph.ca/~antoon/circ/rft1.htm

As both my breadboards were occupied with other projects, I decided to
just solder the thing onto a perf board. I then got my walkman and
switched it to FM trolling up and down the dial for a signal.
Click to expand...
Why did you switch your Walkman to FM? What do you think
the transmitter is transmitting?

Nothing.
Click to expand...
Not surprising.

Thinking I may not have made enough turns on the coil, I redid it and
soldered it a second time. Still nothing!
Click to expand...
Still not surprising.

You desperately need an oscilloscope. Preferably a
"cheapie" with as few functions as possible, because you
need to understand the basics first.

How much "basic" knowledge do you have? You might find
this link useful:

http://www.tpub.com/neets/

Direct, step-by-step, no bullshit stuff you _need_ to know.

Download the modules you think you need. Then, download
the rest.

One question.

The webpage mentions "Hookup wire" being used for the antenna and
"magnet wire" being used for the coil. What exactly are these types
of wires. I just used regular wire hoping it would work but obviously
it didn't.
Click to expand...
What do you mean by "regular"?

"Hookup wire" usually means "generic" in that it'll
handle DC currents up to an amp or so (because for anything
larger, solder isn't enough), and its insulation is good up
to near 600VDC (because for anything higher "generic" isn't
adequate).

I usually keep a spool of vinyl-insulated 22ga. handy for
"hookup" purposes. But on SMD boards it's way too big, which
is what "wirewrap" wire is for. ;>)

"Magnet wire" doesn't have the plastic jacket you're
probably thinking of as "insulation", just much stronger
varnish than the jacketed stuff. Many people (including me)
think of the jacket as a protection for the "real"
insulation, the varnish you usually have to scrape off to
get the solder to stick (if the solder sticks without
scraping, the varnish ain't there).

The wire probably worked fine, but the transmitter isn't
doing what you though it would.

Mark L. Fergerson
 
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