Electronics Forum / Electronics / April 2004

Schematics, DIY articles and/or kits, "How they work" articles for CDI
systems. Need a primer and some discussions of working examples.

Hi, does anyone have any simple schematics for an EPROM programmer?
I have a bunch of 27128's which I would like to program, It would be ideal
to run it from my pc.
I need it as simple as possible as I have a hard time obtaining components

 Here's an idea I've come up with in the past few weeks: make a device
that would create a focused, low-intensity ultrasonic field that could
create (hopefully) a "no-cat" zone in front of a computer-monitor for
instance (this is our problem)  Two problems I see are:

Over the next 4 day Easter weekend, I'll be in a place with no electricity
except the car.
I have an iBook that uses a 24V 3A PSU/Charger.
Can I use the car cigarette lighter socket to charge the laptop battery?

Does anybody know where I can get small TO-220 heatsinks? My local
Jaycar doesn't stock them and they are a discontinued line at Dick
Smith. Yet both sell TO-220 transistors.
Cheers

I've got a radio with a bass boost toggle switch on it but it always
resets to "off" when the power is reset.  I assume its some kind of
standard electronic toogle switch arrangement.  An LED comes on when
the switch is "on".

I need $25k-$30k in a real hurry. It's needed to clear out a maxxed
credit card, pay back taxes and provide for a lifesaving operation. So,
if you're hiring I need your help.
I'm an electronics/computer/software/audio engineer with over 25 years

I was simulating a RF amplifier and I found out that by using a
feedback stabilization network, the input reflection coeffecient is
lowered.  (At the moment I do not have any matching networks, I am
simply seeing what the S-parameters are?)  Why is that?    Does

----- Original Message -----
From: "Jeff Prevett" <jprevett@rogers.com>
Newsgroups: alt.electronics
Sent: Tuesday, April 06, 2004 1:20 AM

I shall remind.. My digital camera fell down (Olympus C-5050). Most of its
parts seems to be fine. The LCD is OK, so is the Zoom , menu etc. But the
problem is that on the photos appear the vertical stripes. I noticed a
certain dependency:

I bought the JC55 speaker kit without cabinet from Jaycar, only to find
that the included instructions contain dimensions of the cabinet, but no
dimensions regarding the location of the drivers or port. If anyone has
this information it would be appreciated.

For those who want a stunning pair of loudspeakers.
http://cgi.ebay.com.au/ws/eBayISAPI.dll?ViewItem&category=14993&item=
3090958131
These were brand new until they were loaned to a store for audition. Full

I am looking for a modem to work under water.  The modem should be low cost and preferably battery powered.  When I say under water I mean that a diver/vehicle will be working underwater and some sensors on him need to transmit serial (RS232) data to a computer on the surface.  ...

I'm trying to simulate a Magnetic field scheme oustide a current loop
and can't come to an equasion that will give me the Mag. field OFF
AXIS... can anyone help me here?
How do i find the distance each time to do the Bio-Savart integral?