test-drb April 2016

test-drb@ccmp.vtda.org

203 participants
299 discussions

by sales＠elecplus.com

When I was at the recycler last week, I saw a lot of really OLD test equipment. I started looking through it to see if there were things I could recognize, but the closest thing I could figure out was a 1940s telephone equipment tester. All of these were portable, with lids that closed with latches. Probably weighed abt 20-30 pounds each. Any cables that might have been needed to run the equipment was gone. If things like this are of interest in the $25 range, then I can pick some up next time … [View More]

8 years, 12 months

Shipping big things across the atlantic.

by pontus＠Update.UU.SE

Hi. I'm considering to ship an empty full height rack from the USA to Sweden. It is definitely something I wont find here so it might be worth the cost and effort. What are my options to get it here safely? If you have any experience I would greatly appreciate if you could share them. Thanks in advance, Pontus.

8 years, 12 months

Voltage regulator with alternate voltage source...

by wulfman＠wulfman.com

You should be just fine. On 4/7/2016 1:38 PM, Bill Sudbrink wrote: > If you have a circuit which is normally designed to > operate with an unregulated supply, through a regulator... > say unregulated +8 through a 7805 to a regulated +5 and > you want to test it independent of the +8 supply, if > you leave the unregulated rail unattached and put +5 > switcher straight onto the regulated +5 rail, will you > damage the 7805? Clearly the VIN is open, but the ground > pin … [View More]

8 years, 12 months

Why do good floppy disks go bad?

by jplist2008＠kiwigeek.com

I had one of those Japanese Koan moments recently when someone asked me "Why do floppy disks stop working?" and I realised I... didn't actually know. I thought I'd throw it to the group and get some theories/proofs. Let's work on the assumption we're talking about 5.25" and 3.5" disks. Several guesses: - Repeated use slowly wears away the magnetic media layer on the mylar. - When left in an unprotected state, or a poor environment, damp, mold and dust can damage the surface, either … [View More]

8 years, 12 months

Voltage regulator with alternate voltage source...

by ard＠p850ug1.demon.co.uk

> > > 1) I have a 12 volt DC supply. 12 volts seems to be > > > within the VIN range for the 7805s whose data > > > sheets I've now read. Can I simply apply 12 volts? > > > > Yes, but that regulator might get mighty hot! I would > > not do this for fear of cooking the poor thing. > > That's what I figured to start with, before reading the > datasheets. If as your photos (in another message) suggest it will run OK from 8V with no … [View More]

8 years, 12 months

Voltage regulator with alternate voltage source...

by ard＠p850ug1.demon.co.uk

> > First, a few quick "whys": > > 1) The 7805 is actually a Motorola MC7805CP, date > code 7308 with gold leads. Very hard to exactly > replace. Any reason why it would have to be an exact replacement? In any case, the behaviour of the 7805 if you apply a voltage to the output with the input floating may well depend on the manufacturer and even the date (some devices were improved over the years). Unless you have a 1973-or-so data sheet from Motorola, I don't … [View More]

8 years, 12 months

Voltage regulator with alternate voltage source...

by wdonzelli＠gmail.com

> 1) The 7805 is actually a Motorola MC7805CP, date > code 7308 with gold leads. Very hard to exactly > replace. Is that the big flat plastic package with the wide flat leads? I might have a few of those around, but I agree, not an easy variant to find. > 1) I have a 12 volt DC supply. 12 volts seems to be > within the VIN range for the 7805s whose data > sheets I've now read. Can I simply apply 12 volts? Yes, but that regulator might get mighty hot! I would … [View More]

8 years, 12 months

Dumb terminals for daily use today; failure scenarios

by echristopherson＠gmail.com

If one were to use a dumb CRT terminal from the early '70s regularly in this day and age, would it be more prone to hardware failure than if it were kept in storage or just kept to look at but powered off? -- Eric Christopherson

8 years, 12 months

VCF Europe, April 30th - May 1st, Munich + registration for VCF Berlin

by stueberahoo＠yahoo.de

Hi list, the 17th edition of VCF Europe[0] is coming soon! It will take place on April 30th and May 1st in Munich, Germany. Please be aware that the information on the English version of the website might be outdated or less detailed than on the German page, but Google Translate will help. Also the registration for VCF Berlin[1] in October is open now. We are looking for speakers, workshop instructors and exhibitors, both for the regular exhibition and this year's special exhibition on … [View More]

8 years, 12 months

Pinging Joe Rigdon

by connork＠connorsdomain.com

Anyone know if Joe Rigdon is still around? Thanks, -Connor K

8 years, 12 months

← Newer
1
...
22
23
24
25
26
27
28
29
30
Older →

Jump to page:

2025

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

2009

2008

2007

2006

2005

2004

2003

2002

2001

2000

1999

1998

1997

test-drb April 2016