Electronics Forum / Design / May 2009

Robotics and programming Tutorials
http://www.botskool.com/tutorials/electronics/general-electronics/building-rf-re
mote-control
http://www.botskool.com/online-compiler
http://www.botskool.com/tutorials/electronics/8051/input-output-instructions-805
1-assembly-language

Howdy folks.  I've been looking into how floppy drives work again,
interested in tinkering with them myself for fun in projects, but have
some questions.  I also wouldn't mind some confirmations/corrections
of my info by folks who actually know about this stuff, unlike

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I have found a site where you can learn Arabic FREEEEEE. I have cut &
paste their adv. For those who like to get the benefit.
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Hi All.I'm looking for a very low noise amp chip, about 1 watt is all I
need.  I have used the LM386 (crap) and the TDA2822, more satisfactory, but
I need to get rid of more of the white noise/hiss.  Any ideas on a more
suitable chip, or components to help aleviate the problem.

hi can help me??
i want to build wireless using uhf,and crystall oscillator
please send me a schematic
i really need your help

I said I'd post this awhile back...it turns out that my softcopy of the
last third or so of the book is corrupt. :(
Here's the first two-thirds, anyway:
http://electrooptical.net/hanbury/hanbury1.pdf

Wiring a Wall Type RJ45 Jack...
http://www.analog-innovations.com/SED/WallType_RJ45.jpg
for a pass-through into another room.
I presume I should use the "A" terminals, though I have not a clue,

Well, maybe I *shouldn't* say that here, because I know some people have
rather large ferrite transformers...  Still, it's big as home built projects
go.
http://webpages.charter.net/dawill/Images/Induction1002.jpg

He's a very opinionated guy -- would fit in quite well here. :-)
Check out this page of his:
http://www.talkingelectronics.com/projects/SpotMistakes/SpotMistakesP8.html --  
is the extra circuitry in the solar charger necessarily a mistake?  The

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I would like to create a bench power supply for experimenting with
audio circuits. I'm not an EE and I'm just doing this for fun so I'd
like to do this as cheaply as possible. I'm looking for advice about
creating such a supply from existing or inexpensive components.

Anyone tried to use these phototransistors before?  I purchased a few
from Digikey to see if they would work in a color sensing application
I have, and they don't see red!  I am trying to figure out if I just
can't read a data sheet, or if they have a bad batch of these out

The person in the following thread writes something very interesting:
http://forums.creative.com/creativelabs/board/message?board.id=speakers&thread.i
d=15106
"The problem with the big heatsink at the back is it is not directly
connected to any heat producing components, a major ...

I was yesterday playing with some lithium cells and a red LED.
I noticed if I shine that LED on my hand I could feel some warm
feeling.
But sort of dismissed it as imagination...