Electronics Forum / Electronics / April 2005

Hi all...... I need to install a visual indicator for a KVM box
indicating which computer is selected. I am wondering where I can get
enough power to drive a couple of leds. The only possibility I see is
from the serial port, however I understand that only a few milliamps are

  I've been asked to help fix a Sharp CRMC-A310JBEO remote control
for an air conditioner. All that seems to be wrong is that it's been
dropped and the ceramic resonator's broken into tiny bits, making it
impossible to see what frequency was marked on it.

Does anyone know of a full-bridge driver that can drive the primary of a
transformer off a 240V line. Most of what I've seen is 80V maximum line
voltage. I have a 390V maximum voltage. Or would I have to use charge pumps
or gate drive transformers.

Could someone recommend a gps module suitable for use
in embedded projects (pic and lpc21xx) , robotics and hooking up to a
(laptop/pc with windows and osx drivers).
Either 3V or 5V powered, ASCI output via rs232 or i2c or spi - (NMEA 0183)

does anyone have a copy of hp4275A manual in pdf or hardcopy I could aquire
for a small sum?
WAYNE

I just got a UPS that uses a sealed lead battery.  I know that certain types
of batteries will develop the so-called "memory effect" if you recharge them
before they almost completely run out.  So I'm wondering if sealed lead
batteries suffer from the memory effect?

I'm looking to build a NiCd charger to charge 2 or 4 1.2V NiCd's
The only circuit I've come across is for a 9V battery
(http://www.uoguelph.ca/~antoon/circ/nicd.htm)
Has anyone tried to convert this to change 2 or 4 cells. Or can anyone

From todays "Brussels News"...
EEC Propose change to 60Hz, 110V
The EEC Commission has proposed that member states begin research in to the
feasibility of changing the frequency of the mains frequency from 50Hz to

looking for fault remidies for
this tv to do with noise in picture
when first turned on, but thay
go away after about 1-2 minits.

im making this project (a pic programmer)
http://www.bobblick.com/techref/projects/picprog/picprog.html
it requires a .1uf ceramic capactor but i canf find one at home what
otehr alternatives can i use if any

Can anyone recommend a DTMF generator/decoder for use in the uk?
Thanks Michael

I have a Weller 100/140 watt soldering iron. I used it until I need new
tips,
so I bought Weller brand tips, I put them on and started using the iron and
then a funny smell

Some kind of "Gun Like" device that, when pointed at an object, say a
wall of wood, and you activate the device, it "hits" the wall of wood
with some kind of concentrated wave of energy, and a bang! is heard
from the wall directly where the device was pointed (It is not touching

Hello, there:
I was a VLSI engineer in China, I worked in digital integrated circuits
design
for a few years and I am looking for opportunities in Australia. What are