Re: Atari PSU with collapsing 5V rail

> On 20 Aug 2017, at 23:20, Chuck Guzis via cctalk > wrote: > > On 08/20/2017 12:12 PM, Brent Hilpert via cctalk wrote: > >> If the transformer were faulty and heating up internally, it would seem >> unlikely that it would cool off that quickly to recover, IME it takes some >> time for a tra

Re: Atari PSU with collapsing 5V rail

On 08/20/2017 12:12 PM, Brent Hilpert via cctalk wrote: > If the transformer were faulty and heating up internally, it would seem > unlikely that it would cool off that quickly to recover, IME it takes some > time for a transformer to cool off. I have an open-frame linear PSU that started behav

Re: Atari PSU with collapsing 5V rail

>> >> Any clues appreciated. It’d be nice to feed the 6VAC input from another >> source but I’m not sure my VARIAC will go that low. > > > The gain pin is presenting the output of the error amplifier, an increase > there is what you would expect as the output V falls, as the difference > betw

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Re: Atari PSU with collapsing 5V rail

On 2017-Aug-20, at 4:45 AM, Adrian Graham via cctalk wrote: > I think I’ve mentioned this PSU before but the question I have might be > applicable to other cheap switchers. This lump for the original Atari 520ST > is run by an NE5561N control chip with a D45H1 switching transistor. It’s > suppli

Re: Atari PSU with collapsing 5V rail

Well, if we're going to nitpick it's _baling_ wire as in tying up bales of hay; bailing is for leaky boats. m - Original Message - From: "drlegendre . via cctalk" To: "Adrian Graham" ; "General Discussion: On-Topic and Off-Topic Posts" Sent: Sunday, August 20, 2017 2:01 PM Subject: Re

Re: Atari PSU with collapsing 5V rail

I must admit, by all appearances I've fallen for a false etymology.. at least so far as having origins in WWII slang. Depending on how you view it, the origin of 'jerry-rigged' is either much older +or+ slightly newer.. Here's an interesting and somewhat detailed discussion: https://english.stacke

RE: DEC VT125 on Schpock in Birmingham, UK

> -Original Message- > From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Rob Jarratt > via cctalk > Sent: 19 August 2017 23:33 > To: 'Paul Anderson' ; 'General Discussion: On-Topic and > Off-Topic Posts' ; 'Pete Hollobon' > > Subject: RE: DEC VT125 on Schpock in Birmingham,

Re: Atari PSU with collapsing 5V rail

As far as I know, the relevant ('temporary/improvised') concept is generally accepted to be (or at least originally to have been) "jury-rigged." https://en.oxforddictionaries.com/definition/jury-rigged http://archives.cjr.org/language_corner/the_jury_is_in.php Nothing to do with WWII, though pe

Re: Atari PSU with collapsing 5V rail

Arrgh! /Jerry rig/, not Jury rig! Jury rigging is something entirely different.. The former comes from WWII era slang, when German soldiers were called 'Jerries' (among other things); see Jerrycan for instance. As has often been the case, as the war drew to a close and the supply chains broke down

Re: Atari PSU with collapsing 5V rail

> On 20 Aug 2017, at 16:32, Mattis Lind wrote: > > > > söndag 20 augusti 2017 skrev Adrian Graham via cctalk >: > Hi folks, > > I think I’ve mentioned this PSU before but the question I have might be > applicable to other cheap switchers. This lump for the orig

Re: Atari PSU with collapsing 5V rail

söndag 20 augusti 2017 skrev Adrian Graham via cctalk : > Hi folks, > > I think I’ve mentioned this PSU before but the question I have might be > applicable to other cheap switchers. This lump for the original Atari 520ST > is run by an NE5561N control chip with a D45H1 switching transistor. It’s

Re: Anyone need an M7389 card (for an LA30)?

> On Aug 19, 2017, at 10:10 PM, Mattis Lind wrote: > > BTW. I have LC11 manual and drawings. But they are for the older M791. At > least a bit helpful. Not scanned yet. I'd be very interested to see those once scanned. I haven't gotten to the interface card yet; so far I've just been working

Atari PSU with collapsing 5V rail

Hi folks, I think I’ve mentioned this PSU before but the question I have might be applicable to other cheap switchers. This lump for the original Atari 520ST is run by an NE5561N control chip with a D45H1 switching transistor. It’s supplied by a multi-tap transformer giving 2x2 feeds of 6VAC an

RE: Anyone need an M7389 card (for an LA30)?

Van: Mattis Lind via cctalk Verzonden: zondag 20 augustus 2017 07:10 Aan: Fritz Mueller; General Discussion: On-Topic and Off-Topic Posts Onderwerp: Re: Anyone need an M7389 card (for an LA30)? lördag 19 augus

Re: DCC-116 E / DATA GENERAL NOVA 2/10 / Nixdorf 620 - Restoring and restarting

On 2017-Aug-20, at 12:08 AM, Brent Hilpert via cctalk wrote: > On 2017-Aug, at 12:10 PM, Dominique Carlier via cctalk wrote: >>> >>> Question: a faulty voltage regulator can behave in this way? I always >>> thought it worked or it did not work, but not between the two states >>> depending on the

Re: DCC-116 E / DATA GENERAL NOVA 2/10 / Nixdorf 620 - Restoring and restarting

On 2017-Aug-19, at 12:10 PM, Dominique Carlier via cctalk wrote: > Maybe it's better to give us all the useful information these power supplies, > moreover it might be useful to other people with the same computer. > > An overall bloc diagram of the D-116 power supply including G1 and G2. > http: