Groups > alt.folklore.computers > #155072

Re: 1957 LED

From	"Charles Richmond" <numerist@aquaporin4.com>
Newsgroups	alt.folklore.computers
Subject	Re: 1957 LED
Date	2015-12-11 15:46 -0600
Organization	A noiseless patient Spider
Message-ID	<n4fg25$dmd$1@dont-email.me> (permalink)
References	<aa4ec05a-2408-4323-b7fe-34d6d61651cb@googlegroups.com> <m9kay.15466$qz7.15339@fx01.iad> <n4cmfc$ftc$1@dont-email.me> <alpine.LNX.2.02.1512102259410.27954@darkstar.example.org> <0d119fef-f0bc-4a84-9213-3a647e06ee48@googlegroups.com>

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<hancock4@bbs.cpcn.com> wrote in message 
news:0d119fef-f0bc-4a84-9213-3a647e06ee48@googlegroups.com...
> On Thursday, December 10, 2015 at 10:57:47 PM UTC-5, Michael Black wrote:
>
>> But can you put light through a diode not intended to generate light, and
>> get light?
>
> FWIW, electric motors can be reversed to become generators.  Back
> in the 1930s, railways made use of this feature with something
> called dynamic braking.  With it, to slow down the train, the
> motors were switched to be generators, and the generated power
> was fed into resistors.  The load slowed the train down, and
> saved on wear on the friction brakes.
>

With some of the early Winchester disk drives, when shutting down the 
computer... one needed to run a "parking" program that unloaded the disk 
heads and moved them over a "landing zone".  Later drives were 
"self-parking";  when the power was removed from the drive, the spin-down 
inertia of the platters made use of the drive motor as a generator.  The 
power thus generated was used to auto-park the disk heads.  As least that's 
how I heard it...

I am thinking of old Seagate drives like this one:

http://redhill.net.au/d/5.php

-- 

numerist at aquaporin4 dot com

Thread

1957 LED hancock4@bbs.cpcn.com - 2015-12-10 11:03 -0800
  Re: 1957 LED Al Kossow <aek@bitsavers.org> - 2015-12-10 11:06 -0800
    Re: 1957 LED Michael Black <et472@ncf.ca> - 2015-12-10 14:44 -0500
      Re: 1957 LED hancock4@bbs.cpcn.com - 2015-12-11 07:41 -0800
        Re: 1957 LED Ahem A Rivet's Shot <steveo@eircom.net> - 2015-12-11 16:37 +0000
        Re: 1957 LED Michael Black <et472@ncf.ca> - 2015-12-11 14:42 -0500
    Re: 1957 LED philo <philo@privacy.net> - 2015-12-10 13:56 -0600
      Re: 1957 LED Michael Black <et472@ncf.ca> - 2015-12-10 22:59 -0500
        Re: 1957 LED "Osmium" <r124c4u102@comcast.net> - 2015-12-11 08:20 -0600
          Re: 1957 LED Michael Black <et472@ncf.ca> - 2015-12-11 14:33 -0500
      Re: 1957 LED Quadibloc <jsavard@ecn.ab.ca> - 2015-12-13 07:58 -0800
        Re: 1957 LED Michael Black <et472@ncf.ca> - 2015-12-13 13:00 -0500
      Re: 1957 LED Lon <lon.stowell@comcast.net> - 2015-12-13 12:48 -0700
        Re: 1957 LED Stan Barr <plan.b@bluesomatic.org> - 2015-12-14 09:07 +0000
          Re: 1957 LED Michael Black <et472@ncf.ca> - 2015-12-14 11:47 -0500
          Re: 1957 LED rpw3@rpw3.org (Rob Warnock) - 2015-12-16 14:55 +0000
            Re: 1957 LED Stan Barr <plan.b@bluesomatic.org> - 2015-12-16 16:32 +0000
              Re: 1957 LED Michael Black <et472@ncf.ca> - 2015-12-16 14:17 -0500
              Re: 1957 LED "Charles Richmond" <numerist@aquaporin4.com> - 2015-12-16 18:15 -0600
                Re: 1957 LED Stan Barr <plan.b@bluesomatic.org> - 2015-12-17 07:58 +0000
                Re: 1957 LED Andrew Swallow <am.swallow@btinternet.com> - 2015-12-17 13:21 +0000
        Re: 1957 LED Ingo Paschke <ipaschke@lpclabs.de> - 2015-12-14 11:11 +0100
    Re: 1957 LED Stephen Wolstenholme <steve@easynn.com> - 2015-12-11 10:58 +0000
      Re: 1957 LED Lon <lon.stowell@comcast.net> - 2015-12-13 12:50 -0700
        Re: 1957 LED Stephen Wolstenholme <steve@easynn.com> - 2015-12-14 12:57 +0000
          Re: 1957 LED "gareth" <no.spam@thank.you.invalid> - 2015-12-14 14:07 +0000
            Re: 1957 LED Stephen Wolstenholme <steve@easynn.com> - 2015-12-14 14:33 +0000
    Re: 1957 LED hancock4@bbs.cpcn.com - 2015-12-11 07:31 -0800
      Re: 1957 LED Quadibloc <jsavard@ecn.ab.ca> - 2015-12-13 07:42 -0800
        Re: 1957 LED Ahem A Rivet's Shot <steveo@eircom.net> - 2015-12-14 09:39 +0000
        Re: 1957 LED Jon Elson <jmelson@wustl.edu> - 2015-12-14 17:07 -0600
          Re: 1957 LED Alfred Falk <falk@arc.ab.ca> - 2015-12-15 18:53 +0000
            Re: 1957 LED Michael Black <et472@ncf.ca> - 2015-12-15 15:05 -0500
              Re: 1957 LED hancock4@bbs.cpcn.com - 2015-12-16 07:32 -0800
                Re: 1957 LED Alfred Falk <falk@arc.ab.ca> - 2015-12-16 17:23 +0000
                Re: 1957 LED Michael Black <et472@ncf.ca> - 2015-12-16 14:23 -0500
                Re: 1957 LED Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2015-12-16 20:13 +0000
                Re: 1957 LED hancock4@bbs.cpcn.com - 2015-12-16 13:15 -0800
                Re: 1957 LED Michael Black <et472@ncf.ca> - 2015-12-17 14:53 -0500
                Re: 1957 LED "Charles Richmond" <numerist@aquaporin4.com> - 2015-12-17 14:17 -0600
                Re: 1957 LED Michael Black <et472@ncf.ca> - 2015-12-18 19:43 -0500
                Re: 1957 LED "Charles Richmond" <numerist@aquaporin4.com> - 2015-12-20 20:02 -0600
                Re: 1957 LED hancock4@bbs.cpcn.com - 2015-12-21 10:31 -0800
                Re: 1957 LED Michael Black <et472@ncf.ca> - 2015-12-21 14:53 -0500
                Re: 1957 LED mausg@mail.com - 2015-12-21 20:27 +0000
                Re: 1957 LED Uncle Steve <stevet810@gmail.com> - 2015-12-17 18:48 -0500
          Re: 1957 LED davidmylastname@acm.org (David Griffith) - 2015-12-16 02:43 +0000
          Re: 1957 LED Mike Spencer <mds@bogus.nodomain.nowhere> - 2015-12-16 17:44 -0400
  Re: 1957 LED scott@slp53.sl.home (Scott Lurndal) - 2015-12-10 19:13 +0000
    Re: 1957 LED "gareth" <no.spam@thank.you.invalid> - 2015-12-10 20:17 +0000
      Re: 1957 LED Lawrence Statton <lawrence@sengiuo.mx> - 2015-12-10 17:10 -0600
      Re: 1957 LED Michael Black <et472@ncf.ca> - 2015-12-10 23:00 -0500
        Re: 1957 LED isw <isw@witzend.com> - 2015-12-10 21:21 -0800
          Re: 1957 LED Stan Barr <plan.b@bluesomatic.org> - 2015-12-11 08:01 +0000
            Re: 1957 LED Michael Black <et472@ncf.ca> - 2015-12-11 14:30 -0500
            Re: 1957 LED "Charles Richmond" <numerist@aquaporin4.com> - 2015-12-11 15:36 -0600
              Re: 1957 LED Stan Barr <plan.b@bluesomatic.org> - 2015-12-12 07:55 +0000
                Re: 1957 LED mausg@mail.com - 2015-12-12 11:20 +0000
                Re: 1957 LED Stan Barr <plan.b@bluesomatic.org> - 2015-12-12 15:39 +0000
                Re: 1957 LED Michael Black <et472@ncf.ca> - 2015-12-12 10:50 -0500
                Re: 1957 LED Stan Barr <plan.b@bluesomatic.org> - 2015-12-13 08:00 +0000
                Re: 1957 LED "gareth" <no.spam@thank.you.invalid> - 2015-12-13 11:10 +0000
              Re: 1957 LED Lon <lon.stowell@comcast.net> - 2015-12-13 12:51 -0700
        Re: 1957 LED "gareth" <no.spam@thank.you.invalid> - 2015-12-11 10:59 +0000
          Re: 1957 LED Ahem A Rivet's Shot <steveo@eircom.net> - 2015-12-11 15:46 +0000
            Re: 1957 LED "gareth" <no.spam@thank.you.invalid> - 2015-12-11 17:37 +0000
              Re: 1957 LED Ahem A Rivet's Shot <steveo@eircom.net> - 2015-12-11 18:34 +0000
                Re: 1957 LED Michael Black <et472@ncf.ca> - 2015-12-11 14:49 -0500
                Re: 1957 LED "Charles Richmond" <numerist@aquaporin4.com> - 2015-12-11 15:39 -0600
                Re: 1957 LED Bob Eager <news0005@eager.cx> - 2015-12-11 22:46 +0000
                Re: 1957 LED Michael Black <et472@ncf.ca> - 2015-12-11 19:07 -0500
                Re: 1957 LED Bob Eager <news0005@eager.cx> - 2015-12-12 01:04 +0000
                Re: 1957 LED Ahem A Rivet's Shot <steveo@eircom.net> - 2015-12-12 08:54 +0000
        Re: 1957 LED hancock4@bbs.cpcn.com - 2015-12-11 11:52 -0800
          Re: 1957 LED "Charles Richmond" <numerist@aquaporin4.com> - 2015-12-11 15:46 -0600
            Re: 1957 LED Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2015-12-11 22:56 +0000
        Re: 1957 LED "Charles Richmond" <numerist@aquaporin4.com> - 2015-12-11 15:35 -0600
        Re: 1957 LED Quadibloc <jsavard@ecn.ab.ca> - 2015-12-13 07:51 -0800
  Re: 1957 LED Lawrence Statton <lawrence@senguio.mx> - 2015-12-10 17:09 -0600

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