Electronics Forum / Basics / August 2007

I have two very simple questions about capacitors. My answers differ from
those on the answer sheet. Can someone please explain where I have made a
mistake.
1. Two capacitors C1=10 microfarad and C2=15 microfarad are connected in

Let's say I've got some 4-ohm speakers that are advertised to take up
to 400W.
Let's also say I want to build a 200W audio amplifier.
Since P=IV, and I=V/R, P=V^2/R, or V=sqrt(PR) (where R=4 ohms).

Recently people talk about energy saving in the elecrticial home
appliance.such as the use of electronic ballast to substitude the
conventional ballast.
I checked out some source. states that only 20% reduction in energy

I found this on the web:
http://www.ramseyelectronics.com/cgi-bin/commerce.exe?preadd=action&key=UAM2
http://www.ramseyelectronics.com/downloads/manuals/UAM2.pdf
Seems to rely on the TPA3001D1:

Rise up and shine, white sons and daughters
Rise up and shine, you gotta fight to part those waters
When we swim in the light, all will be okay
The black, yellow and brown man will wash away.

In April of '89, I rented a cable-converter-box from United Artist. It
was obviously an analogue cable-converter as at that time, there were
no digital equivalents. It had red LED display for the channels. I
gave it back to United Artist Cable in August of '92.

I have a Telechron clock radio from the early 1950's. I'm going to
build this circuit (it's in the middle of the page):
http://ourworld.compuserve.com/homepages/Bill_Bowden/page10.htm "AC
line-powered LED's"

i want to build(rather than buy) a remote for controlling xxms via
lirc.I've already built the receiver part.Can anyone give any pointers?

Please don't neglect this message. Please respond with reasonable
answers.
In April of '89, I rented a cable-converter-box from United Artist. It
was obviously an analogue cable-converter as at that time, there were

EDT [European Deaf Telephone] and EDTN are the TDD protocols used in
Switzerland. Where can I find technical information about the EDT/
EDTN? Also, I would like to hear some tones resulting from the remote
EDTs/EDTNs located in Switzerland. I live in USA, so if I dial an EDT/

I don't want online sources, I would like to know if there are any
books which have circuit puzzles I can solve starting from basics on
upwards to more and more complex circuits.  I'm talking analog
circuits here with resistors, capacitors, inductors, transistors, op

Hello, all, I'm not sure I'm posting this in the right group but I did
some searching and this seems to be the best forum for this type of
question.
What I want to do, and seem to lack the correct terms to define it as

Greenhelm Engineering is looking for volunteers who wish to make a
difference by applying their engineering skills. To get involved in
the Greenhelm projects or to learn more about the organization, please
visit www.greenhelm.com .

I need help selecting a 0.1uF non-polarized capacitor for a project I am
working on.  The capacitor  would be used in an RC filter between an
accelerometer and  microcontroller to minimize clock noise.
I have read that a polystrene cap  would be good for such an application.

<alt.comp.hardware snipped & rec.audio.opinion added>
Hi:
EDT [European Deaf Telephone] and EDTN are the TDD protocols used in
Switzerland. Where can I find technical information about the EDT/