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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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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 |
#2
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John Crane wrote:
--------------------------- Does anyone know of a source for 784 MHz crystals? ** You mean kHz. I'd like to try to 'accurize' the timer in the HP-45 calculator. ** You need a broken HP-55 to scavenge one from. ...... Phil |
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On Wed, 19 May 2021 21:12:30 -0500, 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. I doubt any go that high. -John |
#4
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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. |
#5
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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. |
#6
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On 5/19/21 10:12 PM, Phil Allison wrote:
John Crane wrote: --------------------------- Does anyone know of a source for 784 MHz crystals? ** You mean kHz. I'd like to try to 'accurize' the timer in the HP-45 calculator. ** You need a broken HP-55 to scavenge one from. ..... Phil 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 |
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#8
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In article ews.com,
John Crane 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 |
#9
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John Crane wrote:
================== Phil Allison wrote: John Crane wrote: --------------------------- Does anyone know of a source for 784 MHz crystals? ** You mean kHz. I'd like to try to 'accurize' the timer in the HP-45 calculator. ** You need a broken HP-55 to scavenge one from. 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. ** 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 |
#10
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In article ,
says... 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. ** If you have done any Googling on this at all, you know that there is no such company. Stop being such a naive PITA. Do you mean this company : http://bomarcrystal.com/ |
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