Electronics Forum / Basics / June 2007

Looking to get my office elevator to take me straight to my front
door...have sub-bio energy signature recognition plate, looking to mod
the unit to meet my front door.  Am I going to need a foyer for this?

picmicro 18f452 is a RISC family but it has 75 instruction set.why?
does a RISC micro can have 75 instruction set?

I want to do some landscape lighting and wondering if using  a 12volt
system(20 watt bulb) is more efficient than normal 120 volt  (20 watt Bulb).

Hi, I have a schematic  of an opamp circuit that is biased by a
positive and negative voltage source. I was thinking I can convert it
to single supply by doing the following:
- replace ground reference of dual supply circuit with Vcc/2 .

What kind of "Molecule" is the elctron "attached" to when
created in a Generator?
I do some electronics & other:
http://www3.telus.net/public/quark5/electronics1.html

Looking for feedback on positronic wave stabilizers.  I've had mine on
the workbench for about three months, can't get particles to separate
without abstract relay discharge.  Nothing worse than a black hole in
the middle of dinner...lol.

I'm having a bit of difficulty understanding the following terms:
A "pull up resistor".
[But then I have a bit of a problem when folk say they have "added a
load" to a circuit, with a resistor, when I would have said (in my

I have a DC-DC 200W power supply that likes to take 12V (plus or minus
1V).  Finding that an XBox 360 adapter yields 203W 12V I set about
hooking it up to the power supply and it works.
The xbox cable has three 12V connectors and three grounds.  I only

I'm a newbie wanting to muck about with picaxe projects partly to
learn and partly to make some long-wished-for gadgets, eg datalogging
battery charging and meteorological/power generation info, and a
keyless front door lock.

Recently had a strong black hole -- probably a G20, at least -- appear
right near the garden in my back yard.  Kids wanted to keep playing,
throwing things in it, have about half the pool toys inside.  Have to
give them credit!

Does anyone know how to check a BC548B transistor using a basic digital
multimeter?
I have been trying to use the resistance and continuity checker but whatever
combination of red/black leads on any of the 3 pins does not appear to do

Shall I store my eight year old Samsung waist high refrigerator:
*unplugged?
*unplugged, except for 5 minutes every 3 months, for exercise?
*plugged, but that isn't "storing" it, so forget it.

I have something simple but I can't seem to find an answer to it.
I am getting a different Vpp measurement on the scope from the signal
generator. When put in a 1Vpp 200KHz square wave from my signal
generator, while the frequency is dead on at 200KHz, I got a reading

HELLO ,I AM SOPHY GEORGE.I HAVE A BLOG ON ELECTRONICS.PLEASE RATE MY
BLOG AND GIVE NECCESSARY COMMENTS THERE.MY BLOG ADDRESS IS
http://electronics-4-you.blogspot.com

Looking at this wifi antenna design:
http://wireless.gumph.org/articles/homemadeomni.html
got me thinking of a series of articles Jerry Sevick wrote for CQ
magazine about twenty years ago showing how to do impedance-matching