Electronics Forum / Electronics / November 2005

Hi I'm wondering if any of the members here can help.
I'm trying to find out if there is a technical or trade name for the digital
countdown instrument seen in the old test videos counting the final seconds
to a detonation. I don't mean the whole piece of apparatus but rather the

I have in my parts collection what look like a complementary pair of
power transistors, of Tandy origin, from years ago, part numbers RS2019
and RS2027.
I can find reference to the 2027 being an MJE34 but I can't identify the

I've seen in a few schematics lately a resistor nomenclature that is new to
me, such as "6K8" or "4K7".  In such a designation, what do the "8" and "7"
refer to?  If it weren't for the added eight and seven, I would assume six
kilo-ohms and four kilo-ohms, but the added designators ...

I've just completed this device and it does what it's supposed
to(distort a guitars output signal) but has no gain... Can anyone help
me try and get more gain out of this pig? Perhaps change some of the
devices values...add pots? Who knows I don't... see this hyperlink to

Has anybody out there got one of these - the "T" version with the timer
function?

I am looking for a connector that is as small as possible for power entry.
I have a Neutrik powercon M/F set but, the female panel mount requires more
than an inch depth!
The device I am working with has 1 inch depth, so the panel mount connector

hi, just a simple problem, whenever i have my 5.1 speakers on, and i
change position on fan switch, or when the washing machine is running,
especially when the motor alternates every few seconds, i get crackles
and pops through the speakers, just wondering if there were any ...

I asked how can I turn on a 12V relay from a ttl signal before and I got the
circuit below as a response. I tested it and it works fine but unfortunately
I tested it by supplying 12V into the 2.2k resistor. Now when I've connected
it to my little cpu it doesn't work. When I ...

Anyone know a valid email address for Bright Star Crystals?
brightstar@bigpond.com bounces, and the phone rang out when I tried to
call them.

Spending large sums of money for textbooks for EE is a scam because
classical EE is an old discipline and it could be taught perfectly
using mostly booke now out of copyright from old age or from government
free use texts like Navy rate training manuals.

Sorry if wrong group, please point me to a more appropriate group if
necessary.
I need someone with a TDR to measure a UTP run in a hotel in Las Vegas
(off strip) - I need to tell how many cable feet exists in a UTP

I have put my list of interesting web sites to do with electronics in
Australia up on the web for anyone to use.
see http://www.internetscribe.com/linklist.asp?progroupid=5
If you know of any worth while sites to add, please do.

Anyone have any opinions on what SONY / BMG have done
with CD protection on recently released music CDs?
I have read a hell of a lot of stuff online in various forums.
Anyone actually been hit with one of these CDs?

In this new generation bicycle light system, no battery is needed, no
friction on any parts of the bicycle. The lights flash regardless speed
of the bicycle and weather conditions (unlike normal dynamos!). Very
bright.

Is it possible to automatically shut down pc's including the power supply to
save power in a large office of over 100 pc's eg shut down Friday afternoon.
Can this be achieved on Windows 2000 and Windows XP operating system.  What
sort of savings will this achieve if pc's are ...