433MHz schematic.

Discussion in 'Wireless & RF Design' started by nerdegutta, Jan 5, 2013.

  1. nerdegutta

    Thread Starter Moderator

    Dec 15, 2009
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    Good evening.

    Not too long ago I saw the schematic for this:

    [​IMG]
    ... or equal.

    It was on AAC, and I think it was Bertus who posted the schematic.
    Have anyone seen it, or know where it has gone.

    Thanks.
     
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  2. nerdegutta

    Thread Starter Moderator

    Dec 15, 2009
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    This circuit look like almost the same.

    What type of transistor is T1? BF 199 or BF 494?

    What type is the Op Amp? LM358 or TL082?
    [​IMG]
     
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  3. bertus

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    Apr 5, 2008
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    Hello,

    The shown transmitter uses a saw filter as frequency reference.
    The transistor must be a UHF type.
    The shown reciever is a super regenerative type, wich may give interference with other remote circuits.
    Better use a super heterodyne type.

    On this website you will find modules that can be used for remote control:
    http://www.quasaruk.co.uk/

    Bertus
     
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  4. nerdegutta

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    Thanks, Bertus.

    With the proper software, will the receiver circuit manage to receive what the transmitter is transmitting?

    One time you posted a image of both a transmitter and a receiver. Two circuits in one image. Been searching, googleling and searching again to find the circuits, but nothing.

    I got a few TX and RX, like those in the link. Now I was curios of making them self, and maybe integrate them in my prototype.
     
  5. bertus

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  6. nerdegutta

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    Thanks a million!

    Found it on the page in the link, see attachment.

    Thanks again, and now it's bookmarked and saved. :)
     
  7. bertus

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    Hello,

    Keep in mind that the shown schematic is not crystal locked.
    With standard ceramic capacitors the transmitter will drift with the temperature.
    Use high quality capacitors with low a temperature coefficient.

    Bertus
     
  8. nerdegutta

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    Dec 15, 2009
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    Okay...


    How about using the transmitter in the first post, and the receiver we found? Or is that also a super regenerative type?
     
  9. bertus

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    Hello,

    The second receiver is also a super regenerative receiver.
    There is a potmeter at the base to adjust the "sensitivity".
    When this is not correctly adjusted, the receiver will act as an oscillator.

    Bertus
     
  10. nerdegutta

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    Dec 15, 2009
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    I'll keep that in mind, thank you.
     
  11. bertus

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  12. nerdegutta

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    Dec 15, 2009
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    Yes, I noticed that. Thanks.
     
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