Electronics Forum / Basics / January 2008

List of Solution manuals:
Engineering Circuit Analysis 6Ed - Hayt Solutions Manual
Norbury - Solutions manual for mechanics and thermodynamics
Physics For Scientists And Engineers - Solution Manual

It is a three step process:
1. Buyers of same/similar items form a CLUB.
2. Invite sellers to bid on the club items - A REVERSE AUCTION.
3. Once the sellers bid, the moderator NEGOTIATES with the sellers for

After hours of flaming frustration that no one in the world makes
around-the-ear (aka "can") headsets for cell phones (I wear hearing
aids), I found that Sennheiser HMD 280 PRO cans (apparently) come with
no end connector, and you are expected to wire in whatever you want.

I'm looking to convert a flashlight I have to LED, the flashlight uses
a 6 volt "lantern battery but the LED's max voltage rating is 3.1
volts DC.  What value resistor would I need for this?  I also want to
run it off a 9 volt supply, again I need to know the value of the

I am interested in building a FM Radio but cannot find a kit to
construct.  I am looking for a kit that has good selectivity on the FM
band.  Preferably one without any ICs but I can do with it if the kit
has ICs.  Does anyone know where I can find a good FM kit to build?  I

Two questions really:
1:   I have some old LED's but don't know what the forward voltage or
current is for any of them. Is there anyway of finding out ?
2:  If I have some LED's with a Vf of 3.4V and If of 30mA could I wire

I've been experimenting with detecting reflected laser pulses in the
532nm (visible green) wavelength. By modulating the pulses and tuning
a receiving circuit I've been able to get the detector to work over a
distance of several feet in a darkened room.

For putposes of video demonstrations in the field, I would like to
operate a 32-inch LCD television set from the back of my van. I was
thinking of carrying a couple of pre-charged deep cycle 6-volt
batteries and a 2000w inverter (to 110v AC).

Hey, all, I thought this would be easy but it's not been so far.  What
I want to do is take a DC power supply and output an AC voltage.  The
power supply I'm using puts out 6 volts DC and is marked that it can
handle 1.66 amps output.  All I want to do is take that and turn it

A few days ago, I was in a room on the third floor, the
window was open, some people were conversating
down at street level.  Their words came in, clear as a
bell, almost like being in the same room.  I was surprised,

i need to program the at89c51ed2(atmel chip). i am using the usb-rs232
for this purpose. all my circuit connections are properly wired n
everyhting recheked a thousand times. but still, the programming
software that i use, in order to program the chip, gives me a

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I'm not sure if this is the right group to post this in or not but I
couldn't find anywhere more appropriate so I hope it's welcomed here.
I have a cheap Kodak EasyShare camera that can record video. I also
have a wireless network and a laptop. I want to modify my camera so

3M's data sheet (from Digi-Key):
<http://rocky.digikey.com/WebLib/3M/Web%20Data/EPS-300%20Tubing.pdf>
says that the EPS-300 tubing's insulation rating is 700V/mil. The 3/16 tubing
is 0.020 inches (20 mils) thick, when shrunk, which means it's rated to over

Would anyone know where I can find a table which lists different power
converters strengths and weaknesses? I am looking for a table which
would help me select a topology for a particular application.
For example: