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4 pin vs. 2 pin crystal (3.57MHz)

Discussion in 'Beginner Electronics' started by Farce Milverk, Nov 26, 2006.

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  1. Hi,

    I have 2 crystals rated at 3.57 MHz (for driving video)

    One is 2 pin, and the other is a 4 pin. I have the 4 pin working, but not
    the 2 pin -

    I am looking for info on how to substitute a 2 pin in place of a 4 pin.

  2. Hi John,

    Can you point me to info on why this is the case?


  3. Ross Herbert

    Ross Herbert Guest

    What John means is that the 4 pin device you have is an active
    oscillator while the 2 pin device is simply a crystal which requires
    other active components to get it to oscillate. The 4 pin oscillators
    are commonly used to produce clock signals for IC devices. 2 of its
    pins are simply to provide + and - power for the internal oscillator
    which uses a crystal to set the frequency. The 2 pin crystal doesn't
    have the oscillator part so you need to provide it.
  4. Great explanation thanks. I have one more question:

    Does the 2 pin have a Pin 1 identifier?
    Or is this a component that doesn't care?
    I see XTAL and EXTAL in the schematic, but don't understand what this means?
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