Electronics Forum / Electronics / June 2004

Hi, all
I have to build an IR projector. I need to very brightly light up range of
about 15-30cm. I was thinking of using some superbright IR LEDs (if those
exist) and position them along the edge of object.

Spent just over two weeks there. Got snapped 3 times by those
invisible speed cameras. Totaled fines --- $150. Demerit points nil.
Go figure? One of those fines in Bris would have cost me $90 and 1
demerit. Lucky for me the bris speed cameras stick out like bulls

Just wondering if there are any plans for the TIVO to be released in
Australia in the future?
Is there anywhere I could purchase one that is fully compatible with
Australian TV's and would work fine with no problems?

I've got a garage door opener that's about 3 years old, made by Chamberlain.  Brand name is "Access Master" but they also sell
them under a bunch of other names including Sears Craftsman and Liftmaster.
Symptom is that when you try to close the door, it won't move and the overhead ...

Hi all, i am doing a memory upgrade to a compaq presario 2240.It is going
from 32meg to 128meg, but in bios it only shows up as 48meg.If i put a
256meg stick in it only shows 80meg.
What am i doing wrong.I have updated the bios.

I'm trying to do a simple tension follower for frecuency
up to 100MHz. Actually I'm using a BF998 with a R=1k attached
to the source, but i'm observing that the tension output not
resembles very well the tension input (about a 1/3 attenuation)

I just bought a diplexer so I could use a UHF and VHF antenna together and
noticed that the UHF connection for the signal is not connected
to anything on the PCB only the earth is.
Is it normal?

By the way, does anyone recharge non-rechargeable batteries? About three years
ago when I was still a kid (age 14), I came up with this idea in a dream. Since
then I've recharged batteries at least hundreds of times and only have had
about 10 explosions. Any clue if this is wise to ...

G'Day All
Looking around for a Triac to use on 415v to switch a coil on a contactor,
(just the 'garden' variety contactor). Can't see much in the trade cats for
stuff here in WA, I'm working on min spec 800v. Does that sound OK ?? if so

Hi everybody out there !
I'm having problems with a LM393 (open collector output)used as a
voltage controller to a 12V lead battery: when voltage drops below
minimum voltage a

Hi folks, I need some direction in diagnosing a condition that I have
created. I wanted to install a 2 Kw. fan heater under my computer
desk, didn't want to have just high & low settings, but wanted the
heat to be continuously variable.

Am looking for error codes/diagnostic routine for a F&P GW608 washing
machine.
All my Google searches lead to
http://www.dougsmithspares.com.au/faultcodes.htm which no longer

In "ETSI TS 101 191"(the standard of SFN) there is a block named "Network adapter"
I want to know what it exactly do and what are its functionalities?
thanks.

I am trying to use the 16x16 analog switch matrix part #AD75019 from
ANALOG DEVICES.  I am controlling it using a PIC. The problem is,
regardless of what I put on SIN, SOUT is stuck HI.  Is there some sort
of precharge sequence to initialize the connections?  this is very

I need the thinnest dielectric material that I can find. It has to be a
sheet - like I can order 1 sq ft. of it. At the same time, it needs to have
the greatest dielectric constant (is this what it's called? Where it is the
most resistant to giving into high voltages?)