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wireless on/off switch power control

Discussion in 'Radio and Communications' started by rajbarath_eee, Mar 26, 2011.

  1. rajbarath_eee

    rajbarath_eee New Member

    Oct 4, 2010
    Am new to rf circuits,ie. only of little knowledge.
    I need a radio controlled (rf) transmitter/reciever circuit pair.

    I need to operate a led, dc motors and other small appliances. To turn on and off.

    It may be Working in the frequencies of 27mhz, 35 r 45 mhz. or as suitable
    of my question. The lenght range of my tx/rx can be of few meters
    from 4-5mts.
    The overall circuit voltage is of a small operating voltages.
    3-5v for transmitter and 3-6v for receiver.

    Only a basic simple form of circuit i need.
    Because i need both to be small in size.
    The transmitter can have a single switch r button.
    The receiver must r just give an output of a single pulse
    whenever the transmitter button is pressed.

    The output pulse will be used to trigger a flip flop for turning the
    rest of the circuit for power control.

    If the rf is not suitable and if any other wireless can be used also ok. And i neglected ir since it needs line of sight even it is simpler and cheaper.
    And dont know of anyother wireless types.

    Only i need is wireless, small distance , without line of sight (passing opaques),low voltage, a reciever output of a single pulse and simple components circuits of getting easily.

    And i would be thankful of own circuits instead of websites or exact websites of my critiria, since am tried of surfing the whole nets,googles and i dont know how to find it.

    any other suggestion is also welcome.

    rf transmitter/receiver pair circuits to turn something on and off
  2. HarveyH42

    HarveyH42 Banned

    Feb 25, 2006
    Not Here
    RF circuits are a pain to build, but I probably gave up before I got good enough test equipment. Not saying it can't be done, just that the results are weak, and a little unstable. Must agree, that many of the circuits found on the web, are great to begin with. A simple RF switch can be had for under $10, good for over 100 feet, and available at most any hardware store. Wireless doorbells...
  3. rajbarath_eee

    rajbarath_eee New Member

    Oct 4, 2010
    thanks for the reply.
    s i agree. ofcousre. ok. then any other way to make a wireless switch. plz help me. I have read more on it and have shearched a lot.
    but why there is no any circuits regarding that. Just a simple circuit using 555 timer , or using any ic's, or any other idea? . Or , Is there any infrared circuits of wireless without line of sight , or any optical wireless.. but cheap in circuit and construction., just to give a single pulse of output.
    Last edited: Mar 28, 2011

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