Electronics Forum / Basics / December 2006

some one tell me that it is possible to get the light from the
transmission line using  faraday's priciple  of electromagnetic,
presently i am thinking on that  if such system  present then contact
me..

I have a high power (2600 watts @ 4ohms min. mono bridge) amplifier
that I would very much like to be able to have turn on  via the
existing 12v trigger in my av preamp.  Any any suggestions as to the
specific component(s) and the cleanest, safest method of installing

I'm finally getting around to building an electric fishing Kontiki and
have some questions about how to do so. First off an electric Kontiki
is basically a timed torpedo with a prop either at the rear or more
recently at under the front to take a line out past the breakers into

When would one use a transistor?  mosfet?  hexfet?
Basically looking into PWM switching of medium-sized DC motors (12V,
~5A or so).
Which should I use...?  A beefy transistor like a TIP36C?  Or a hexfet

I need a simple PWM circuit to control a motor from my microprocessor,
I found this one:
http://home.cogeco.ca/~rpaisley4/LM555.html#17
Any comments?  It looks cheap and simple to build so should fit my

Let's say I have a shaded pole motor, which controls a blower fan
(basically a bathroom vent fan).
Let's say I have a 12VDC car battery, and a 12V-120V step-up
transformer.

I've been told to perform a test on a 2.4GHz radio front end (LNA
and filters).  While I've done many IP3 tests, I'm not sure I fully
understand how to do a proper IP2 test.  Any guidance would be most
appreciated.

Can I get the complete circuit for electronic ballast with list of
components for 220 to 240 ,50 Hz v input?

Is it possible to make a bearing out of a ring magnet and a smaller
magnet held above above the center of the ring by NS SN or SN NS
repulsion?
The smaller magnet could be prevented from flipping with a non magnetic

I have lucked up on a Ecotech high output emergency vehicle alternator for
the boat project.  This hyper expensive alternator puts out full output at
very low RPM which makes it very attractive for charging my bank of four L16
batteries.  The problem is it is designed to output a ...

Hi there-  I'm hoping someone can help me.  I'm thinking of purchasing
a space heater with the following ratings
Amps - 12.6
Watts - 1500

I am doing and RF application with PIC chip and using picbasic pro to
write my code. My poblem is that I have a 8 bit number I want to send
serially. The serout command work up to 8 bit , so the number should
not be distorted, Althought I want to use manchester encoding which

I am novice!! can any one help me out? for a project I want to drive
series leds using led driver.The led output driver is programmed to be
either open-drain with a 25 mA current sink capability at 5 V, and 10
mA source capability at 5 V.To drive leds in series for higher current

As all microprocessor instructions finally boils down to 0/1 through
output pins. This means that we can build a microprocessor that does
nothing but just generates 0/1 through output pins, in a desired way.
Functionalities can be built on the top of such microprocessors. Such

Hello again,
I found this National Semiconductor brief on True RMS Detector:
http://www.national.com/ms/LB/LB-25.pdf
In reference to the following circuit (highlighted in red):