Electronics Forum / Electronics / November 2007

ABCO Automation, Inc., located in Brown Summit, NC, is seeking both an
experienced Electrical Engineer.  Contract and full-time positions
available.  Responsibilities include designing and implementing
control systems in-line with project budgets, schedules and customer

We have 1000's of GE & Dialight Luxeon LED traffic signal arrays.
These are very high Lumen (up to 1580,  yellow). Some units on sale at
EBAY right now. $40 each.
Contact us at 2@astrotoo.com

If you know what Skype is (Skype.com), you'll understand why
3's new SkypePhone release is disruptive.
Cf The Australian article for one side of it:
 http://www.theaustralian.news.com.au/story/0,25197,22671672-15306,00.html

hai,
i have 220vac/75vac 460hz transfromer
shall i test it with 230vac 50hz supply

hi, i am after a  basic type schematic  to controll the speed of a 12 volt
dc  automotive cabin  fan .
seems to be a bit of a problem in these  saab`s.
any schematic  using a  mj11032  or  mj11016 darlington  would be good. if

I have an old GE (Model GE341) small color TV with the rotary Channel
selector. I'm trying to connect a VCR to it. Could somebody tell me if there
is a particular channel set aside for that - or in any event how do I go
about it. Regards

as per above thanks

Anyone know if I can source something like this :
http://www.hometech.com/techwire/boxes.html#4760224E
here in Oz?
Even better if its 19" so I can drop a standard patch panel in to it.

    Anyone know of any good books or websites on building a rotary three phase
converter suited to Australian conditions?. Most American designs use 220V  
which is
two active wires taken from the pole transformer with neutral being the  

Can someone explain why the freezer section of my refrigerator is working as
normal but the lower section seems to have thrown in the towel.
It's just your ordinary garden variety fridge, six years old.
Does this mean expensive repairs?

I am wondering if anyone has managed to convert/use a standard antenna
rotator for tracking purposes? I know that very expensive antenna rotators
are available for this use but hey there is no fun or challenge in that!
Want to use it to automate tracking the sun - have two solar ...

I have a three phase genset, lister sr3 engine and three phase 15kw
generator. only two of the three coils are hooked up inside the
generator, the third is wired to the transfer block, but not hooked to
the output anywhere. I hooked the two power wires to my house and have

Here's the application:  i have 2 12vDC power supplies which i need to
monitor.  I want to make sure that the output voltage doesnt drop
below say 10v or so. Just need a dry contact.  I could just use a cube
relay with a 12v coil, but want something more reliable.  Any

** This recent eBay sale in Sydney is hard to believe:
http://cgi.ebay.com.au/Sky-Raider-light-blue-bakelite-valve-radio_W0QQitemZ28017
1016722QQihZ018QQcategoryZ933QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
$ 4300  for a 1950s, plastic case, non working valve radio ??
.......   Phil

Origin have 1kilowatt solar power system fully installed for $4,495, after
$8,000 goverment rebate and $1,000 renewable energy rebate. So all up it
costs about $5 per watt for solar power that is meant to last 30 years. On
average 1kw array will produce 6kw hours per day of ...