Source for 784 MHz crystals?

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

Reply to
John Crane
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** You mean kHz.

** You need a broken HP-55 to scavenge one from.

..... Phil

Reply to
Phil Allison

I doubt any go that high.

Reply to
Lucifer

Make that kHz.

Reply to
John Crane

Make that kHz.

Reply to
John Crane

Yes, that's possible. I have a HP-55 and it works, so I don't want to cannibalize it. I'm sure there has to be some company that can custom manufacture crystals to specs. I did try Bomar, but have not received a reply.

-J

Reply to
John Crane

Many crystal companies that make them for indivuduals have gone out of business. For the ones that are still in business you can expect to pay from $ 50 to $ 100 for a one of a kind. Thre is a company in England that makes crystals to order, but you are still looking at over $ 50 each.

Years ago there were several companies in the US that would make about any crystal you wanted. Now most radios use one master crystal and from there use electronics to cover all the frequencies, there is not much demad for the crystals. Unlike years ago where each radio frequency required a seperate crystal.

Reply to
Ralph Mowery

You probably found this link already:

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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      | @ 
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Reply to
Kendrick Kerwin Chua

** If you have done any Googling on this at all, you know that there is no such company.

Stop being such a naive PITA.

..... Phil

Reply to
Phil Allison

Do you mean this company :

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Reply to
Ralph Mowery

** FFS they don't make one off specials for hobbiest wankers like the OP.

..... Phil

Reply to
Phil Allison

They are just across the river from me, and, in point-of-fact, they do make one-offs for amateurs and hobbyists, albeit at a price.

You spend far too much time under your rock to have any understanding at all of how big and wide the world is, and how many unusual things it contains.... Including brand new multi-section twist-lock capacitors....

Peter Wieck Melrose Park, PA

Reply to
Peter W.

No use arguing with that fool. I think he just likes to spread his crap over the group. I try not to go back to him .

I do know that they will make crystals as a one of a kind for people. There are many on a ham radio group that have ordered from them. The price is high , starting about $ 50 each . I never did like the Bomar brand but have bought some from them about 40 years ago when several companies would make almost anything you wanted. Most are out of business now. There is a place in England that is reported to be a good company by other hams, but their prices are still around the $ 50 mark per crystal. I did special order a few crystals from International Crystal just before they went out of business.

Reply to
Ralph Mowery

The drongo from Down Under is much like a hognose snake, but without the utility. All pretense and threat, no actual substance. At least the snakes eat vermin.

Peter Wieck Melrose Park, PA

Reply to
Peter W.

If that is the case, then how can you not have learned that Usenet is a "party line"?

You cannot post to "*one* person" on Usenet. You can only post a follow-up to an article, and that follow-up is *read by all* readers of the group (i.e., a "party line") and can be further followed up by anyone who wishes to do so.

To send something to "just one person" you have to use email.

How can you have been posting to Usenet for 20 years and not have learned this fact?

Reply to
Phil the Idiot

Phil has never been overly burdened by facts. They get in the way of its carefully managed world view.

Peter Wieck Melrose Park, PA

Reply to
Peter W.

SiT1576 would be even better, albeit in CSP package and need the programming tool. But then it needs no additional MCU and needs only around 15 uA for the 784 kHz.

--
mikko
Reply to
Mikko OH2HVJ

There's factory-programmable oscillators that use internal logic to create custom frequencies, which has better cost and leadtime than custom crystals.

DigiKey will even program it for you...

Reply to
whit3rd

I bought a couple similar to those. Problem is that if you want to put them very close on frequency like you can with a crystal and trimmer capacitor you are out of luck.

They only cost a few dollars, under $ 5 if I recall correctly instead of around $ 50 that Bomar would want for a crystal. They do put out a waveform roughly equal to a square wave.

Reply to
Ralph Mowery

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