- Source for 784 MHz crystals? - 6 Updates
- Faulty SMPSU. - 2 Updates
- Westwind Trantor Hard Disk for Osborne Computer - 6 Updates
| John Crane <john_crane_59@yahoo.com>: May 19 09:12PM -0500 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 |
| Phil Allison <pallison49@gmail.com>: May 19 08:12PM -0700 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 |
| Lucifer <LuciferMorningstar@bigpond.com>: May 20 09:11PM +1000 On Wed, 19 May 2021 21:12:30 -0500, John Crane >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 Crane <john_crane_59@yahoo.com>: May 20 10:42AM -0500 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. |
| John Crane <john_crane_59@yahoo.com>: May 20 10:42AM -0500 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. |
| John Crane <john_crane_59@yahoo.com>: May 20 10:44AM -0500 On 5/19/21 10:12 PM, Phil Allison wrote: > ** 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 |
| T i m <news@spaced.me.uk>: May 19 09:13PM +0100 On Mon, 17 May 2021 15:43:12 -0700 (PDT), whit3rd <whit3rd@gmail.com> wrote: <snip> >That's the likely culprit, probably will need to be desoldered to find the part >number, and will be easy-ish to test. Sometimes there's two diodes, center >pin common, in this form factor. Update: Whilst waiting for the smaller components to turn up I've de soldered the two devices on the rear of the board to check the part numbers and (as you say), the three legged one is a rectifier, a '30H150C' and I've tested it with my DMM (diode test) and it checks out ok on that (centre pin to both outsides, both ways round etc). I hope it's good under load as they don't look as easy to find as the switcher, a KA1M0800? Cheers, T i m |
| legg <legg@nospam.magma.ca>: May 20 08:32AM -0400 >hope it's good under load as they don't look as easy to find as the >switcher, a KA1M0800? >Cheers, T i m Any change in performance with ANY of these part subs? RL |
| Rayner Lucas <usenet202101@magic-cookie.co.ukNOSPAMPLEASE>: May 19 06:35PM +0100 In article <s833d4$2a5$1@posie.signal11.org.uk>, mjb@signal11.invalid says... > I must have got the alternate-flavour ones, somewhere between burnt > toast and toffee. Although 100% unwanted when coming out of a piece of > electronic equipment, it's not *that* bad. :) I was remembering a lingering phenolic reek that took hours to dissipate even with the windows open, but that was from the Schaffner power inlet incident so the scorched potting gunk may well have contributed that particular fragrance :-) R |
| Mike Coon <gravity@mjcoon.plus.com>: May 19 07:48PM +0100 In article <MPG.3b0f5cd6e94faab2989690@news.eternal-september.org>, usenet202101@magic-cookie.co.ukNOSPAMPLEASE says... > even with the windows open, but that was from the Schaffner power inlet > incident so the scorched potting gunk may well have contributed that > particular fragrance :-) For an evil smell I can recommend a failed selenium rectifier from my youth. IIRC like over-cooked school cabbage. I think I might have its successor in the EHT of my homemade oscilloscope... |
| John Robertson <spam@flippers.com>: May 19 12:19PM -0700 On 2021/05/19 6:21 a.m., Mike wrote: > active disk -- any sign of diagnostic LEDs on the drive, as these > can start giving blink-codes to say "Didn't spin up, there's > a head holding me back!" etc. Might need a "Shake & Bake" operation to get it spinning again...I used to pick up the drive and hold it in my hand, then quickly rotate my wrist in the direction of spin to free up the heads. Then back up the disk right away! John :-#)# |
| T i m <news@spaced.me.uk>: May 19 09:24PM +0100 On Wed, 19 May 2021 12:19:25 -0700, John Robertson <spam@flippers.com> wrote: <snip> >to pick up the drive and hold it in my hand, then quickly rotate my >wrist in the direction of spin to free up the heads. Then back up the >disk right away! I had to do similar with a genuine IBM PC that I'd added a FH (5MB) ST506 interfaced HDD to that wouldn't always spin up from power-on (I used it to run the Co BBS (TBBS) and it was typically on 27/7). I would hit the power switch then sharply twist the whole PC around about 45 Deg and back (as you say, on the same plane as the platters) and it always span up. ;-) Cheers, T i m |
| John Crane <john_crane_59@yahoo.com>: May 19 09:08PM -0500 On 5/19/21 1:48 PM, Mike Coon wrote: > For an evil smell I can recommend a failed selenium rectifier from my > youth. IIRC like over-cooked school cabbage. I think I might have its > successor in the EHT of my homemade oscilloscope... Well.. this RIFA smelled like Texas BBQ. Not too bad actually.... -John |
| John Crane <john_crane_59@yahoo.com>: May 19 09:09PM -0500 On 5/19/21 3:24 PM, T i m wrote: > about 45 Deg and back (as you say, on the same plane as the platters) > and it always span up. ;-) > Cheers, T i m Definitely something to try. I'll give it a shot. -John |
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