Help with RF controller

Discussion in 'The Projects Forum' started by jj_alukkas, Jan 8, 2009.

  1. jj_alukkas

    Thread Starter Well-Known Member

    Jan 8, 2009
    751
    5
    I had a r/C controlled toy car lying around and I decided to rip off the board to make a simple car alarm trigger... But the problem is the 27 MHz crystal got corroded and came off from the transmitter.. I couldnt get a new one so is there any way using an LC combo to make the transmiter work w/o the crystal...?? If not can someone help to me to make a new transmitter w/o the crystal??
     
  2. bertus

    Administrator

    Apr 5, 2008
    15,648
    2,347
    Hello,

    A transmitter with an LC circuit will not be as stable as one with a crystal.
    Try to get a new crystal for you set.

    Greetings,
    Bertus
     
  3. jj_alukkas

    Thread Starter Well-Known Member

    Jan 8, 2009
    751
    5
    But My reciever does not have one and None of my other RF boards have... They all use LC.. Depends on volatge though..
     
  4. jj_alukkas

    Thread Starter Well-Known Member

    Jan 8, 2009
    751
    5
    Well Then can anyone help me make a simple single channel relay contol through RF which can control a flip flop or logic?? Please dont insist using crystals. Its hard for me to obatin.
     
  5. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    Gee, where in the world do you live? (you can put it in your profile so that people might be able to help you faster.)

    Here in the USA, there are lots of places to order them from. Digikey, Mouser, Newark, Allied, and many many more. There's a surplus electronics store about a 20 minute's drive from me that has a whole wall full of jars with crystals in them.

    Are there any amateur radio or HAM groups near you? They would know where to find the crystal that you need.

    You saved the crystal that broke off, right? Is it actually 27.045MHz?
    26.965MHz through 27.405MHz is Citizen's Band radio in the States, but
    26.995 MHz; 27.045 MHz; 27.095 MHz; 27.145 MHz; 27.195 MHz are reserved for R/C models.

    You can't just use an RC or LC oscillator for the transmitter; it would "splatter" all over the CB spectrum.
     
  6. jj_alukkas

    Thread Starter Well-Known Member

    Jan 8, 2009
    751
    5
    I have the crystal and its 27.145 MHz.. I tried at the local store but not available.. I can get it but not for immediate application. Thats why. Anyway its ok.
     
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