For pretty good (free) electronic basic learning manuals, the Navy
Electricity and Electronics Training Series 1998 is available on
line in PDF format.

http://hnsa.org/doc/index.htm

Scroll to the bottom

NEETS is also available, in print, on line, from Barns and Nobel for
$4 (new) and at Alibris for $2.30 (used).

The site is also a treasure trove of WW2 historical technical and
tactical information, destroyers, battleships, submarines, and weapons
systems. With links to more sites with more eclectic naval warfare
information.

Even has a link to "THE SUBMARINE COMMANDER'S HANDBOOK

("U.Kdt.Hdb.") 1942 New Edition 1943

This is a secret subject according to paragraph 88 of the
"Reichsstrafgesetzbuch" (Reich Code of Criminal Law) (Edition of 24th
April 1934). Misuse will be punished according to the provisions of
the said Paragraph, insofar as other penalties do not apply.

High Command of the Navy

On Mon, 07 May 2007 00:32:38 +0100, Fred Bloggs nospam.com> wrote:

Tam/WB2TT wrote:

Peter Hucker wrote:

On Sun, 06 May 2007 15:04:37 +0100, John Fields austininstruments.com> wrote:

On Sun, 06 May 2007 15:25:25 +0100, Fred Bloggs nospam.com> wrote:

John Fields wrote:

John Fields wrote:

On Sun, 06 May 2007 13:54:15 GMT, Fred Bloggs nospam.com>
wrote:

I need to make a relay switch on 1 second after a 12VDC line comes on, but switch off immediately the 12VDC goes off. What's the best way to do this? If you need to know why I want this, see the paragraph below:

I have a solar power setup and wish to switch the load between the invertor output and the mains supply. Currently I have a relay with a 240VAC coil which does the switching based on the output of the invertor. It doesn't work too good - the invertor output falls a bit as the battery gets low, and the relay starts jumping back and forth. What I would prefer is to use the 12V signal from the solar regulator (which is on whenever the battery is ok (and is what switches the invertor on). However I need to wait at least 1 second before moving the load to the invertor, as the invertor takes a while to start up.