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Help with oscillator chip

Discussion in 'Electronic Basics' started by Patrick Leonard, Sep 13, 2003.

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  1. I have one of those can-type crystal oscillator chips (2 Mhz) that uses only
    2 leads. Could someone tell me how to wire this thing up? Do I simply
    apply a voltage across it, and that will result in its oscillating? What
    voltage do I use?
  2. There are lots of ways. Don't just apply voltage across it, that won't do

    You need an active device like a transistor or inverter IC.

    Try searching the web for 'crystal oscillator schematic'.

    Bob Monsen
  3. bubaloo

    bubaloo Guest

    You likely have a crystal, which is only one of the component of a typical
    crystal oscillator. It acts sort of like a very high "Q" LC combination.
    There are many different circuit configurations that can be employed (and
    not all will necessarily work so well for your particular device). Do a
    Google search on, say, "crystal oscillator configurations" to get some
    ideas. Here is one link that might be useful
  4. To what ?
    What will you use it for ?

  5. Nothing, really. I just want to look at its output on an oscope.
  6. Well, you can't. What you have is most probaby a "crystal".
    It doesn't have any "output", and it can't do anything without
    an oscilator.

    Now, with just two pins, and after connecting power and ground,
    where did you thought the "signal" would exit anyway ?

  7. Well, you can't. What you have is most probaby a "crystal".
    .....hence my original post :)
  8. Soeren

    Soeren Guest

    Hi Jan-Erik,

    Not that it's done (AFAIK), but it could be - if current driven :)

    Something like this:

    O V+
    +---O Output
  9. Any moderately fast inverter will work. In particular, 74HCT04 or the 4049
    will both work.

    R1 220k
    | |
    | |
    | |\ |
    +---| >O--+
    | |/ |
    | .-.
    | | |
    | | | R2 220
    | _ '-'
    | | | |
    +--|| ||--+
    | |_| |
    --- ---
    --- ---
    | | C1 = C2 = 22pF
    created by Andy´s ASCII-Circuit v1.24.140803 Beta
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