Electronics Forum / Electronics / April 2006

I was talking about this 50 volt soldering iron timer project
September/October 2005 and now have four test prototypes installed in
facilities belonging to a "large Australian telecommunications firm". Two
have relays doing the switching and two use a power MOSFET and the idea is ...

Well it was a laugh to read this.
http://www.cnet.com/4520-11524-6478472.html?tag=cnetfd.ld3

I need to sense the operation of a couple of pumps in the 1 to 2kW range.
Measuring the actual current would be nice, but just knowing they're
operating would be enough. I'd rather not use shunts - I think there's
enough current to be able to see what's going on by attaching ...

Have about 100+ electronics magazimes from 1968 to 2002 with titles like
 Electronics Australia, Everyday Electronics, Practical Electronics,
ETI, Circuit Cellar, etc. to clear
If you pay shipping, the whole lot is yours. Please note that I am

Can anyone explain why people use Si and Ga As for microwave/RF
Schottky diodes and not SiGe?

Hi to my pals here,
In October 2005 I bought myself a DSE  G7659  STB.
It worked like a charm for 17 months or so. Then, it began to misbehave just
as the Commonwealth Games was being broadcast from Melbourne  -   first just

I have a very simple circuit that I run an electric guitar signal
through and I'm thinking of modifying it from a 1.5 V battery to a 9V
battery.  What modifications do I need to do to the circuit? (I am
obviously a beginner).

I am working on a small electronics project that needs a few 2N388
geranium diodes.  The only problem is that they are hard to find and
expensive.  I figured I would give another NPN diode a try but I'm not
really sure what to look for.  Can I just look for a close match based

Hi group...
I have a good challenge 4 U all ( and myself !)
I have a Camera that connects to computer by a USB cable. It can take
video MP4 up to 30 minutes then download it 2 a computer thru a USB.

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I am building up a radio transmission link with 4 bits digital input
signal(around 50-100Hz).  I have got two RF modules which are 315Mhz radio
transmitter and recevicer in 8kbps data rate. Also HT12E(encoder) and HT12D
(decoder) have been used as well.

I recently 'fell heir' to a Birko soldering iron (80W), Birko Cat. no
'D1'. Anyone got any idea how old it is? Following replacement of the
cord and a bit of a cleanup it works really well.
I queried Birko, but they say 'all records have been lost'.

Anyone know whether the pots in the Tx are used in "variable voltage
out" form or "variable resistance" form to control the channels? I
presume, due to 3 wire connection that its the former but id be pleased
if someone could confirm? Im looking at hacking one and applying

I am using a "Hot chip"/"ABC mini" with Atmel AVR AT90S8535 and I am using
ABC editor to connect to pc with parallel port.
ABC editor can detect the hot chip and possible to read, erase, however it
appear a "verify error" box when .hex is program to microcontroller

I recently saw that a firm proposes using existing natural-gas piping to
deliver broadband to homes.  I think that's not a new idea - and I
recall a story from Popular Electronics or Electronics Illustrated,
circa 1957-1960, that showed an antenna farm atop a hill near Port