- Faulty SMPSU. - 4 Updates
- Source for 784 MHz crystals? - 10 Updates
- Westwind Trantor Hard Disk for Osborne Computer - 1 Update
| T i m <news@spaced.me.uk>: May 21 10:48AM +0100 >>hope it's good under load as they don't look as easy to find as the >>switcher, a KA1M0800? >Any change in performance with ANY of these part subs? I'm still waiting for the small caps (might be here today, whilst I have some stock of caps, I never seem to have the spec I want), and I intend, assuming this wouldn't risk any other stuff, to replace the two caps, then opto, voltage reg then switcher in that order (as I believe that was the order you mentioned the likely cause)? The idea being that it might be interesting to see what it actually was? As an aside, I replaced the 4 x 1000uF, 105, LESR output smoothing caps with new caps but with the wrong wire spacing (I was jumping about on eBay and clicked the wrong one) but have some good s/h 1500uF (16V 105, LESR) caps with the right pin spacing that would fit better. Would using higher capacity be 'better', given it's soft start etc or would it negatively influence the L-C of the output and so end up being 'worse'? Cheers, T i m |
| legg <legg@nospam.magma.ca>: May 21 11:06AM -0400 >would it negatively influence the L-C of the output and so end up >being 'worse'? >Cheers, T i m You are, occasionally, reapplying power to check function? RL |
| T i m <news@spaced.me.uk>: May 21 04:08PM +0100 On Fri, 21 May 2021 10:48:32 +0100, T i m <news@spaced.me.uk> wrote: <snip> >intend, assuming this wouldn't risk any other stuff, to replace the >two caps, then opto, voltage reg then switcher in that order (as I >believe that was the order you mentioned the likely cause)? Update: The caps arrived this morning so I re-fitted the txfmr, the switcher and rectifier, then fitted the new caps and tested it. DMM shows around 10V on the DC range (as before off load) but it's jumping about a lot and about .5V on AC. I then replaced the opto and then the voltage reg with the output looking the same each time (allowing for the voltage on the main caps to bleed down each time etc). So are we now looking at the switcher itself and / or is there anything else I can check in the meantime please? Cheers, T i m |
| T i m <news@spaced.me.uk>: May 21 04:13PM +0100 On Fri, 21 May 2021 11:06:41 -0400, legg <legg@nospam.magma.ca> wrote: <snip> >You are, occasionally, reapplying power to check function? I think we just keyed up at the same time? ;-) After re-assembling and between replacing the components, yes. Cheers, T i m |
| Ralph Mowery <rmowery42@charter.net>: May 20 04:19PM -0400 In article <1680d0d3cd96d6c4$1$1693209$e8dda262@news.thundernews.com>, john_crane_59@yahoo.com says... > 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. 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. |
| Kendrick Kerwin Chua <kendrick@nospam.io-nyc>: May 20 04:59PM -0500 In article <1680d0b7e9b61e85$2$1693209$e8dda262@news.thundernews.com>, >> 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 |
| Phil Allison <pallison49@gmail.com>: May 20 06:19PM -0700 John Crane wrote: ================== Phil Allison wrote: > 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 |
| Ralph Mowery <rmowery42@charter.net>: May 20 11:19PM -0400 In article <eb421fd2-8038-49b0-8f5e-96120f8e690dn@googlegroups.com>, pallison49@gmail.com says... > > 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/ |
| Phil Allison <pallison49@gmail.com>: May 20 08:26PM -0700 Ralph Mowery wrote: > > Stop being such a naive PITA. > Do you mean this company : > http://bomarcrystal.com/ ** FFS they don't make one off specials for hobbiest wankers like the OP. ..... Phil |
| "Peter W." <peterwieck33@gmail.com>: May 21 03:45AM -0700 > ** FFS they don't make one off specials for hobbiest wankers like the OP. 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 |
| Phil Allison <pallison49@gmail.com>: May 21 04:15AM -0700 Peter Wanker Fucking Asshole wrote: ----------------------------------------------- > > ** FFS they don't make one off specials for hobbiest wankers like the OP. > 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. ** A price no amateur nor hobbyist would ever pay. Go on - prove otherwise. > You spend far too much time under your rock ** LOL !!!! > to have any understanding at all of how big and wide the world is, ** FFS fuckwits like YOU you cannot even read. > and how many unusual things it contains.... > Including brand new multi-section twist-lock capacitors.... ** How fucking retarded. Wot a vile Septic puke you are. ...... Phil |
| Ralph Mowery <rmowery42@charter.net>: May 21 09:34AM -0400 In article <cf646288-a30b-4169-a89f-430ae343cccan@googlegroups.com>, peterwieck33@gmail.com says... > 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 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. |
| "Peter W." <peterwieck33@gmail.com>: May 21 07:13AM -0700 > 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 . 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 |
| Rob <nomail@example.com>: May 21 02:47PM >> 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. > ** A price no amateur nor hobbyist would ever pay. There still are companies that make crystals for a specified frequency and although it has become much more expensive (probably because of reduced demand) it still can be done. However, I looked up a company where I have ordered before and it seems that this particular frequency is a problem. They provide two ranges, 30-100 kHz and another starting at 800 kHz. (these companies work with stock crystals that they etch towards the requested frequency so you can only order frequencies for which they have the suitable starting point) |
| Ralph Phillips <ralphp@philent.biz>: May 20 05:41PM -0500 On 5/19/2021 3:24 PM, T i m wrote: > wrote: > (I > used it to run the Co BBS (TBBS) and it was typically on 27/7). Another TBBS alumni! I ran The Golddust Plantation back when. RwP |
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