Re: Atari PSU with collapsing 5V rail

2017-08-21 Thread Adrian Graham via cctalk
> 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

Re: Atari PSU with collapsing 5V rail

2017-08-21 Thread Adrian Graham via cctalk
> 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

Re: Atari PSU with collapsing 5V rail

2017-08-21 Thread Jules Richardson via cctalk
On 08/21/2017 10:06 AM, Chuck Guzis via cctalk wrote: Well, to throw some kerosene on the fire, this from Wikipedia: :-) "According to etymologist Jan Freeman, the story that duct tape was originally called duck tape is "quack etymology" that has spread "due to the reach of the Internet and

Re: Atari PSU with collapsing 5V rail

2017-08-21 Thread Chuck Guzis via cctalk
On 08/21/2017 07:32 AM, Jules Richardson via cctalk wrote: > And if we're talking WWII, wasn't it duck tape? Duck cloth with an > adhesive layer. "Duct tape" came later... > > I wonder if we're being messed with ;-) Well, to throw some kerosene on the fire, this from Wikipedia: "According to

Re: Atari PSU with collapsing 5V rail

2017-08-21 Thread Jules Richardson via cctalk
On 08/20/2017 01:57 PM, Mike Stein via cctalk wrote: Well, if we're going to nitpick it's _baling_ wire as in tying up bales of hay; bailing is for leaky boats. And if we're talking WWII, wasn't it duck tape? Duck cloth with an adhesive layer. "Duct tape" came later... I wonder if we're

Re: Atari PSU with collapsing 5V rail

2017-08-20 Thread Adrian Graham via cctalk
> 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

Re: Atari PSU with collapsing 5V rail

2017-08-20 Thread Chuck Guzis via cctalk
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

Re: Atari PSU with collapsing 5V rail

2017-08-20 Thread Adrian Graham via cctalk
>> >> 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 >

Re: Atari PSU with collapsing 5V rail

2017-08-20 Thread Brent Hilpert via cctalk
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 >

Re: Atari PSU with collapsing 5V rail

2017-08-20 Thread Mike Stein via cctalk
ussion: On-Topic and Off-Topic Posts" <cctalk@classiccmp.org> Sent: Sunday, August 20, 2017 2:01 PM Subject: 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

Re: Atari PSU with collapsing 5V rail

2017-08-20 Thread drlegendre . via cctalk
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:

Re: Atari PSU with collapsing 5V rail

2017-08-20 Thread Hagstrom, Paul via cctalk
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

Re: Atari PSU with collapsing 5V rail

2017-08-20 Thread drlegendre . via cctalk
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

Re: Atari PSU with collapsing 5V rail

2017-08-20 Thread Adrian Graham via cctalk
> 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

Re: Atari PSU with collapsing 5V rail

2017-08-20 Thread Mattis Lind via cctalk
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

Atari PSU with collapsing 5V rail

2017-08-20 Thread 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 supplied by a multi-tap transformer giving 2x2 feeds of 6VAC