Electronics Forum / Electronics / October 2007

hello group
I need to make a small circuit that will have 2 Potentiometer inputs and 2
relay outputs using 1 common power supply.The applied voltage to the board
would be 12vdc and the the input voltage to the boards from the

I went to the new Rouse Hill Town Centre (in Sydney) today and there
were digital signs out the front saying how many spots are left in
each entrance. Nothing new there, seen that before many times. But
what I haven't seen before are secondary signs above the turn into

Just collected the November SC from the post office box. I've never
seen so many exclamation marks (one after every single sentence except
the magazine name) and so much glossy glitz on the front of a magazine
since I was waiting in line at the supermarket and looking at New Idea ...

Watch NFL Games Online!
For every one who wants to watch the games online because they dont live in the teams town or are at work i found a site that has basically every game covered. Its perfect if you have afford a monthly $70 direct tv nfl access subscription. they got a bunch ...

I have a 2.1m solid aluminium satellite dish with polar mount and Ku band
LNA (can not guarantee this LNA is working) to give to a good home.
Prospective taker to arrange transport from an Adelaide suburb at their
expense.

There has been recent talk about the Holman water timer from Bunnings
(and I've been singing it's praises), so this may be relevant to some
people.
I have found a bug in the Holman CO1905/6 programmable water timer

G'day all
I've designed and am in the process of making a speaker emulator for Pro
Audio recording application
and would like to add preset memory and midi program change to the unit.

i hv two Sun GDM 20E20 .  some time it got the problem when it was
running. suddenly red color got off. now the only red and green color
comes in screen . in second monitor there is only  red color .plz
help me wht may be  the problem??

For those interested, here is a 1 hour interview with Dave Cochran
from HP Labs, the designer of HP's first digital voltmeter and the
early calculators including the HP 35. The interview is in honor of
the 35th anniversary of the HP 35.

I need to control two 120VAC/5A heating elements off a 240VAC supply.
Two elements will be plugged into one control box and ideally one
"temperature control" is to be fitted to the box. The elements can be
unplugged so that only one element might be operated at any one time. Cost

   Does anyone know if there is a dehumidifier,  instead of using
a humidistat setting,  allows you to set the time on and the time off?
   Example: Set the dehumidifier to run for a half hour, then be off
for an hour.   This cycle repeats over and over.

There used to be many postings here from a Phil Allison, sometimes (but not
always) knowledgeable. But he couldn't enter into any discussion without
insulting the other party and/or using bad language. I think it was a
medical condition. What has happened to him?

I've finally gotten around to DIY PCB etching, so far using the laser
printer toner transfer method (using a Brother HL-2040, works well
other than stinking something awful when paper jams, damned cheap: $98
@ BigW, replacement toner cartridges are ~$60 (recycled) - $80 (new

Possibly OT.
I am trying to dismantle some hard disks. I am encountering some fasteners
that are meant to be tamperproof, one in particular that has a concave
threaded head. Also the usual star point heads (not Phillips). Is there a

Could anyone recommend a person to repair a SOLA 3000VA UPS,
It is in for a quote yet the price for board replacement is quite
extreme. The main board has most of the power switching and a daughter
board with most of the logic. (there still is a lot of logic on the