Electronics Forum / Electronics / September 2005

ok, i know there's more than a few of us who get sick of cleaning things
with either a tissue and bottled isopropyl alcohol, or those crappy little
alcowipes that seem to leave fibres on anything and everything.
baby-wipe size but with iso alcohol would be perfect for cleaning ...

Just had my Westinghouse fridge die a few weeks before the 2 year
warranty expired :-D
The service guy was out within an hour of the call, and the diagnosis
was a dud compressor. A new fridge was delivered and installed by

Looks like Nuts & Volts seems to have disappeared.  Can't get it at any
newsstands I used to.
Other than the remaining ham magazines, are there any other electronics
mags left for hobbyist?

Before anyone starts.
Yes this is commercial advertising.
No I do not consider this spam, I consider it word of mouth of getting the
massage through.

Hi there guys,
I'm in search of a schematic (preferably not a finished product, as I am
limited for space in my box), for a basic 12V SLA Battery Trickle Charger,
that is capable of keeping a battery on trickle-charge almost indefinately.

How can I run 12VDC 4.5Amp fan from 110VAC?  I need AC/DC adapter but I
cannot find anything that can supply 4.5Amp or these cost more than the
fan.  I can build a powersupply but I am not sure how to handle 4.5Amp
issue.  I can get transformer and build DC rectifier.  How do I ...

Anyone know where I can get a DVD player for my laptop to connect via a USB
port. I'd like to get something around $100 in price if possible.

I need to make an 433MHz transceiver that is running half duplex.
I have a separate transmitter and receiver but I need both of these to share
the same external aerial.
Question is, how do I join the two?

Has Silicon chip magazine got a new editor?
or was he listening to some rap music before his new photo was taken?

Decided it was about time I explored the wonders of USB interface
(especially in the light of my latest lappy having no RS232 port..shock
horror) so bought this little demonstrator board from Jaycar. A couple
of ADCs, DACs, 8 digital ins and outs. All you could wish for - and a

I'm trying to set up a simple two way speaker system using the following
components.
Two SR powered speakers and Two Turbosound Powered bass bins.
Both fed from line out mixing desk.

Does anyone know where to get a simple control unit for a proximity
reader?
I'm need to build a single door accesscontrol.
I have a simple proximity reader (for tags) that outputs in Wiegand

Sola 200 power conditioner. Very effective, working mains filter but
based on a ferro-resonant transformer so is noisy and not suited for
home or office.
Sola 400 UPS. Faulty - it trips my core balance circuit breaker.

An eleven-year-old neighbour asked me some questions about electronics, and
I pointed him at aus.electronics, as one does.
A couple of days later his mother fell on me like a ton of bricks, and it is
easy to see why. He had tuned in to the newsgroup in the middle of one of

How?
Actually, what jargon should I use to search for circuits to build.
The background is that I do work for a community group that re-uses old
computers and we currently have premises in an arts centre. Our "rent"