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#1
Posted to alt.electronics
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4 pin vs. 2 pin crystal (3.57MHz)
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. thx, Farce |
#2
Posted to alt.electronics
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4 pin vs. 2 pin crystal (3.57MHz)
On Sun, 26 Nov 2006 17:20:03 GMT, "Farce Milverk"
wrote: 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. --- For the 2 pin you must build an oscillator. -- JF |
#3
Posted to alt.electronics
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4 pin vs. 2 pin crystal (3.57MHz)
"John Fields" wrote in message ... On Sun, 26 Nov 2006 17:20:03 GMT, "Farce Milverk" wrote: 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. --- For the 2 pin you must build an oscillator. -- JF Hi John, Can you point me to info on why this is the case? Thanks! Farce |
#4
Posted to alt.electronics
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4 pin vs. 2 pin crystal (3.57MHz)
On Mon, 27 Nov 2006 02:32:43 GMT, "Farce Milverk"
wrote: "John Fields" wrote in message .. . On Sun, 26 Nov 2006 17:20:03 GMT, "Farce Milverk" wrote: 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. --- For the 2 pin you must build an oscillator. -- JF Hi John, Can you point me to info on why this is the case? Thanks! Farce 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. |
#5
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4 pin vs. 2 pin crystal (3.57MHz)
On Mon, 27 Nov 2006 14:54:36 GMT, Ross Herbert
wrote: 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. --- Right. Thanks! -- JF |
#6
Posted to alt.electronics
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4 pin vs. 2 pin crystal (3.57MHz)
"John Fields" wrote in message ... On Mon, 27 Nov 2006 14:54:36 GMT, Ross Herbert wrote: 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. --- Right. Thanks! -- JF 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? |
#7
Posted to alt.electronics
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4 pin vs. 2 pin crystal (3.57MHz)
On Mon, 27 Nov 2006 18:28:24 GMT, "Farce Milverk"
wrote: "John Fields" wrote in message .. . On Mon, 27 Nov 2006 14:54:36 GMT, Ross Herbert wrote: 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. --- Right. Thanks! -- JF 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? --- It's a don't care. --- I see XTAL and EXTAL in the schematic, but don't understand what this means? If it's for a 4 pin oscillator, that will be a pin which is used to Enable or disable the oscillator. It could be that either a low or a high will enable the oscillator, so you can either try it and find out or go to the manufacturer's website and get the data sheet for the oscillator. -- JF |
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