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

Discussion in 'Electronic Basics' started by zalzon, Jan 3, 2004.

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  1. zalzon

    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?

  2. 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:

    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
  3. zalzon

    zalzon Guest

    I tried this one on for size.

    "The Simplest RF Transmitter"

    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.

    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.

  4. 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.
  5. Why did you switch your Walkman to FM? What do you think
    the transmitter is transmitting?
    Not surprising.
    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:

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

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

    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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