Electronics Forum / Electronics / January 2006

I am a total electronics novice so hopefully someone can help -
My Network router failed, and it turned out to be a burnt out power
transformer. The transformer in question was 12v 1.25a - I have been given a
replacement that is 12v 1.5a and it seems to work (I am using it right ...

I am looking for a motion sensor that simply plugs into to the bayonet
fitting of an existing light.
Sort of like this product:
http://www.jaycar.com.au/productView ...

DUAL SIM CARDS
Australia
TWO PHONE NUMBERS ON THE ONE MOBILE PHONE.
No need to carry two phones or change sim cards.

Sorry for the long winded post but there is a bit of history to
this.
Items involved are a Sola 305 UPS (manual and specs here
http://lit.powerware.com/ll_download.asp?file=sola620rm.pdf) ,

I presume that, with RS232, it's possible that a receiving device may miss
the first byte or two of data while trying to synch with the Tx?
I mean, if no handshaking is used, how can the receiving device tell the
start and stop bits from the character bits, if it joins the dataflow

I hope you can help here.  I've just started working for a new employer and
one of the first projects I have is to develop and interface/reader for
Sony's memory cards.  CF and SD cards, IDE and SCSI I've done before and the
information was pretty much readily available.  In this ...

I've ordered a plasma screen and noticed that the specs for the
external stereo speakers are 8 watts @ 6 ohm.
I don't intend to connect it up to a home theatre system, just attach
a couple of reasonable quality bookself speakers, which are 8 ohm.

I just add a new pic16f84a project in my web site :
http://www.micro-examples.com/public/microex-navig/doc/150-p16f84-single-nixie-c
lock.html
it is simple single-digit nixie clock (C source code + schematics), I hope
you will enjoy it !

I am looking for an autoranging front-end circuit to convert a
universal AC input ( 90-265VAC ) to an unregulated DC voltage ( in the
range of 220-400VDC ) to power some DC supplies at 90 Watts.
It seems that such a front-end should operate as a doubler/rectifier in

I took a chance and used a 1/2W 2K resistor with an LED to indicate 48V
on.  That resistor cooks up real nice.  Any recommendations on a safe
way to do this?
thanks,

pretty standard issue deal, few capacitors on a motherboard have rabies and
are frothing at the caps and the thing no longer works. Assuming no damage
has been done to surrounding/other components, i figure it will work if
replaced. However, i don't have a regular account with ...

Have just picked up a low power ( about 200w ) wind powered battery
charger, that I plan to install on the family's holiday shack that has
no mains power.
The charge regulator that comes with the kit regulates for charging a

My Rotel audio CD player has started to skip a little bit of the music
occasionally. It is usually at the same place on the disc each time.
It skips on some brand-new discs as well as on some old disks. Those same
discs do not skip when played on another, identical, Rotel player.

I have a Sharp TV, model SX80J9. It was bought in 2000.
It has four inputs, TV, AV1, AV2, AV3.
AV1 is used for the VCR and AV2 is used for the DVD.
At the back of the set there is provision for stereo Audio Out.

There are 480,000 different combinations of standard 1% resistor values. If
you need 2.75 volts from a 5.00 volt reference, which of those 480,000 pairs
will give you the closest result?
For this example there are 9 resistor pairs that will get you to within