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devel / comp.sys.hp48 / Source for 784 MHz crystals?

SubjectAuthor
* Source for 784 MHz crystals?John Crane
+- Re: Source for 784 MHz crystals?Lucifer
+- Re: Source for 784 MHz crystals?John Crane
`* Re: Source for 784 MHz crystals?John Crane
 `- Re: Source for 784 MHz crystals?Kendrick Kerwin Chua

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Source for 784 MHz crystals?

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From: john_cra...@yahoo.com (John Crane)
Subject: Source for 784 MHz crystals?
Date: Wed, 19 May 2021 21:12:30 -0500
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 by: John Crane - Thu, 20 May 2021 02:12 UTC

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

Re: Source for 784 MHz crystals?

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From: LuciferM...@bigpond.com (Lucifer)
Newsgroups: comp.sys.handhelds,comp.sys.hp48,sci.electronics.repair
Subject: Re: Source for 784 MHz crystals?
Date: Thu, 20 May 2021 21:11:42 +1000
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 by: Lucifer - Thu, 20 May 2021 11:11 UTC

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

Re: Source for 784 MHz crystals?

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From: john_cra...@yahoo.com (John Crane)
Date: Thu, 20 May 2021 10:42:11 -0500
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 by: John Crane - Thu, 20 May 2021 15:42 UTC

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.

Re: Source for 784 MHz crystals?

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From: john_cra...@yahoo.com (John Crane)
Date: Thu, 20 May 2021 10:42:34 -0500
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 by: John Crane - Thu, 20 May 2021 15:42 UTC

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.

Re: Source for 784 MHz crystals?

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Subject: Re: Source for 784 MHz crystals?
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 by: Kendrick Kerwin Chua - Thu, 20 May 2021 21:59 UTC

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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