Electronics Forum / Basics / December 2006

(I don't believe this got posted properly, so I doing it again.)
I believe someone mfgers a device that can be placed along a driveway, and
when a vehicle passes by it sends a wireless signal to an alarm in a home to
signal the event. Whoa! As I was typing this, it occurred to me ...

I have a reversable motor removed from an Oster breadmaker. I want to
use it on a project because the motor runs very quiet. The motor is a
60Hz 120V motor that has three wire. Red, white and blue. The white
wire goes to nuetral on the AC outlet. The other two wires goes to a

I am looking at the IVC102 from Texas Instruments, specifically the
first page:
http://focus.ti.com/lit/ds/symlink/ivc102.pdf
A colleague of mine is testing it under two conditions with pin 2:

Hi again!
Image link:
http://img50.imageshack.us/img50/1584/micpreampac2.jpg
In regards to the circuit above, can someone explain to me the part of

Hello All over the World,
This is no spam. Whe are friends from Holland and whe life in the North
of the netherlands.
Our carbide cannon is now better then better. Whe have rebuild the

Is it possible to use two transistors back to back "leg PN leg leg NP
leg" to make a transistor?  I can't do too much reasearch right now
because I'm on a cruise ship and the internet is expensive.  I had the
idea a few days ago and its killing me.

a question from a total eletronics newbie...
Generally speaking, when it comes to electric circuits, is it fair to
say that they all work by manipulating the current?
For example, the purpose of a resistor (correct me if I'm wrong) is to

I am looking at buying a used Fluke multimeter (either an 8060A or a
77-III) from a local guy and I'm looking for simple tests I can do on
each meter.  Neither meter has a current calibration so I certainly
don't expect the either to be perfect.  I may send it off for a proper

I am looking at buying a used Fluke multimeter (either an 8060A or a
77-III) from a local guy and I'm looking for simple tests I can do on
each meter.  Neither meter has a current calibration so I certainly
don't expect the either to be perfect.  I may send it off for a proper

I'd like to regulate the power through a load
using a basic buck circuit along these lines
         14v
          |

Here's the scenario:  I'd like to be able to
play an audiobook on my living room stereo
where my wife would be listening as she
works on her projects, but I want to be able

I noticed if you hammer a pipe into the earth ,,say in your yard,,and
connect a wire to that,,and use that as the negative wire,,then connect
a wire to the positive of an ac outlet in your home,,the meter shows it
as around 110 volts but at a much lower amperage,,but it will still

I have an elderly neighbor who likes to work in his garage, and likes it
warm. He's had a kerosene heater and now a propane heater. He's not entirely
happy with the price of the fuel. If I were in his shoes, I wouldn't want to
driving back to the h/w store every few days or week ...

I made a sample circuit and I want to calculate the value of hFE. How
can I get the value.
I know hFE=Ic/Ib and Ib is (Vcc-Vbe)/Rb which is about 100uA. In order
to get Ic, I have to know hFE and a sample circuit is not the same

I have an ancient IBM laptop.  I also have a serial remote CDROM
drive.  But, I don't have a pwr sply for the CD drive.  I've obtained
a whole box full of old wallwarts (w/w) and want ot know if any of
them are usable for this cdrom drive.  So, my question is: If I learn