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  • Source for 784 MHz crystals?

    From John Crane@21:1/5 to All on Wed May 19 21:12:30 2021
    XPost: comp.sys.hp48, sci.electronics.repair

    Does anyone know of a source for 784 MHz crystals?
    I'd like to try to 'accurize' the timer in the HP-45 calculator.

    -John

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  • From Lucifer@21:1/5 to john_crane_59@yahoo.com on Thu May 20 21:11:42 2021
    XPost: comp.sys.hp48, sci.electronics.repair

    On Wed, 19 May 2021 21:12:30 -0500, John Crane
    <john_crane_59@yahoo.com> wrote:

    Does anyone know of a source for 784 MHz crystals?
    I'd like to try to 'accurize' the timer in the HP-45 calculator.

    I doubt any go that high.

    -John

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    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From John Crane@21:1/5 to John Crane on Thu May 20 10:42:11 2021
    XPost: comp.sys.hp48, sci.electronics.repair

    On 5/19/21 9:12 PM, John Crane wrote:
    Does anyone know of a source for 784 MHz crystals?
    I'd like to try to 'accurize' the timer in the HP-45 calculator.

    -John
    Make that kHz.

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    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Kendrick Kerwin Chua@21:1/5 to john_crane_59@yahoo.com on Thu May 20 16:59:26 2021
    XPost: comp.sys.hp48, sci.electronics.repair

    In article <1680d0b7e9b61e85$2$1693209$e8dda262@news.thundernews.com>,
    John Crane <john_crane_59@yahoo.com> wrote:
    On 5/19/21 9:12 PM, John Crane wrote:
    Does anyone know of a source for 784 MHz crystals?
    I'd like to try to 'accurize' the timer in the HP-45 calculator.

    Make that kHz.

    You probably found this link already:

    https://davidreaton.com/hp-calculators/hp-45/

    I got to that link from the opposite direction, in that I used to modify
    video game systems and we'd use custom oscillators in place of crystals in order to mess with the region or the video output timing. So the timing
    circuit that Mr. Reaton uses in place of a 784 kHz crystal works on the
    same valid principle.

    -KKC, wandering around the abandoned world of Usenet like the Omega Man.
    --
    -- "People with happy families don't become spies. A bad | kendrick
    childhood is the perfect background for covert ops. You | @
    don't trust anyone. You're used to getting smacked around, | io-nyc
    and you never get homesick." - Michael Westen, /Burn Notice/ | .com

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