Electronics Forum / Electronics / April 2004

I found an 8volt DC wireless camera to use as a backup camera on  my
van. Can anyone help me with a schematic to reduce the 12v battery
feed to the required 8-9volts for the camera? I'm handy with soldering
irons and breadboards but I don't have a clue what components to use.

For those in the UK who may be interested.
Mike

I have a BRAND NEW Jaycar 350watt RMS - 4ohm Subwoofer Amplifier
Module with Remote Control Cat # AA0508 worth $429.00(see link below
for all specifications)
http://www1.jaycar.com.au/productView ...

I'm trying to build myself a decent sounding stereo system. What I have at
the moment is a pre-amp feeding into an active crossover which then feeds
into two power amps, one for the woofers and the other for the tweeters and
mid ranges, with a passive crossover onthe tweets/mids. ...

I posted this to alt.engineering without much success. Perhaps someone here
can help.
I am looking for an article or short description of a general purpose
instrument conditioning circuit.

I'd like to change the LED's inside my computer case (from green to blue)
but I'm not sure if its a matter of simply cutting off the old ones and
soldering on the new ones?
I've read that LED's come in different voltages? If this is the case how

Can I tell with a multi meter if the connection from my antanna on the roof
and the socket on the wall is in good shape ?
If so what do I look for ?
And can I test the same way for different sockets throughout the house.

        What if any are the limitations on driving more than one
appliance -  for instance a TV and a DVD recorder from the one S-Video
output simultaneously ?
regards

I have digital camera (Olympus C-5050). Yesterday it fell down and something
is wrong now. On every photo there are terrible horizontal lines. But
everything else works OK(Zoom, Menu, LCD).
An example of the photo:

if i have an electrical appliance plugged in and then i switch off the
power but DO NOT pull the plug, is it possible that there is still a small
amount of power going to the machine?

I´m an evil computer scientist and I must build HAL, an evil computer.
But what do I need to build an evil computer ?
Cursed ICs and boards ? Where can I get cursed elecronics parts ?

We use a Panasonic TC1464 cordless phone (9V DC, 200mA), but we have the
problem that its present adaptor doesn't work in countries that use ~220V. I
have another adaptor that has the same output voltage, but a higher current
(800mA).

Fred Bloggs
I am keeping botrh timer sections for the reason that I want to have a dark out of reset function so that The 5 hour delay starts when timer section a comes out of reset. For example if Ralay A shuts of at 6.45PM I want relays B to stay on exactly for exactly five ...

I have a couple of CB radios and I was wondering if I could convert one such
that I could install it on the flybridge of my boat and have it broadcast to
a speaker placed inside the cabin of my boat.  I would not need to use it
for any other purpose and the speaker could be ...

I have a Teac CT-M340MKII TV which will switch on fine but after pressing
the channel buttons it switches it self back to standby and the way to turn
it on again is by switching it on and off at the master switch.
Has anybody seen this fault before or is a common thing for this ...