Electronics Forum / Electronics / November 2008

hi, i want to make  up a 13.8 volt  power supply.
i have some 7812 and 7815 voltage regulators.
would it be best to increase the voltage out of the 7812
or

I have a Seiko clock that shows the time in many different places.
The current battery is rather old and the time displays do not show
all the parts of the digits.  I don't need this clock and would like
to sell it, but can't say that it's 100%.  Would a weak battery affect

Slipped into the Altronics Perth store today to purchase a few items with my
trade card
Some of those were 4 packs of rechargeable AAA cells for the cordless phones
in the office.

This in todays herald-sun, a Wollongong prof of engineering says 50
years ago TV's had no electronics. LOL.
http://www.theage.com.au/news/digital-life/how-tos/do-surge-protectors-work/2008
/11/27/1227491712264.html

I have a P.I.R. motion detector  (from Ebay) that turns on six white LEDs.
If I remove one or more of the LEDs the remaining LEDs still glow. If I try
to replace one of the original white LEDs with a common red LED, the red LED
glows and the other five white LEDS do not.

I'm looking for a 3V or 4V, 100mA solar panel to replace the one in an
LED "eternity lamp" such as are used to illuminate headstones.
The panel consists of 8 cells. Its dimensions are 11.5cm x 6.7cm x
2mm. I don't have any leeway in the dimensions, as the replacement

hi , any body know where i can buy some GAL 16V8 CHIPS  ?
thanks,
 mark k

I need to add daytime running lights (DRL-s) to my car, and since I have
separate high and low beam lights, I thought I could use high beams for
DRL-s.
First idea was to connect high beams in series, but since both are

See the attached jpeg which shows how I wired it.  Seems I am
doing something wrong.  I got the Sure-brand DPM 0-20 V from a Hong
Kong vendor, and I downloaded the linked .PDF on the pinout, but
something is wrong.  No, I am not trying to read the 5volt output of

The device that I will sketch vaguely doesn't exist, but if I can imagine  
it anyone can.
I imagined a similar apparatus to a Converter or Decoder that it could be  
placed over a television set, with an infrared sensor what would receive a  

Taking that opportunity to relay AGAIN the Righ Hon Premier Burnett 's
appeal to Australia Greatest Mining Pioneer of all times Tyrwhitt

http://www.elec-bestseller.com.cn/products.asp?id=491
Product Features and Technical Details
Product Features
2.5 GHz Intel Core 2 Duo processor with 6 MB on-chip shared L2 cache,

I have a few questions regarding the upcoming conversion to digital
with over-the-air broadcasts.  Please forgive my naivete.
1:  Are the digital signals, which have become available now, being
broadcast in UHF -- while the analog signals are in VHF?

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From: "Wilson Fisk" <willief@cox.net>
Newsgroups: sci.electronics.misc

I need a low jitter cristal oscillator that I can adjust between 10mhz and
12mhz, I did founded a circuit in this web page;
http://members.iinet.net.au/~davem2/overclock/osc.html
Does it would be good and have a low jitter ?