Electronics Forum / Basics / March 2007

technology and last month I' ve found a way to rectify a bad
Fluorescent lamp which have its filaments going apart. But till now, I
cannot explain how it can happen. Anybody who can explain the theory

Hi guys i am in the process of trying to figure out how and where to
start to build a Analog to digital converter for a project. I have
done some research and it seems that at the basic level its nothing
more that a pulse oscillator circuit followed by a comparator. The

I am writing and reading to a microcontroller.
My largest allowable variables are 16 bit and 8 bit
How can I write a 24 bit value when I am limited by 16 and 8 bit
variables?

Ok ... try not to laugh when i ask... tho i only have a few questions
on designing   a home made transformer..  And of course i dont want to
burn my house down..  so  lets start from there.
I would like to make my own hv transformer  and  thought i would start

Can anyone tell me if it's possible to power leds directly from a
solar panel? I need the light there and then, and not later on via
batteries. Hope this makes sense. Thanks for any advice

Three questions:
1) On a photodiode data sheet, you see the spectral response (i.e.
responsitivity in A/W vs the wavelength), however it never clarifies
if this is for photovoltaic (no bias applied) or photoconductive (with

I have a dust buster (hand held vac) that is considered the 7ish volt
version and whose internal battery is charged with a 11 volt (and some small
number of milliamps) AC->DC converter.
Ok, two fundamental questions:

I have the following scenario. I have to do an automated blinds
installation. The control circuit for the blinds consists of the
following: A microcontroller which switches on two relays for up and
down, a single motor does the up and down. Two limit switches input to

I have a house with 5 heating zones, some radiant heat some cast
iron.  Each zone is controlled with a standard 24V thermostat.  I
would like to create a simple circuit that would make a zone (or two)
slaves to another zone.

I have been told by a catholic monsignor that about 300 years ago it was
realised by measurement that a simple coil can be used for containment.
They then realised the consequences and made a decision to suppress this
fact.

i want a microphone for hearing best than my ears

The screen just got faded and fuzzy at 1152 x 862 pixels, but looks great in
800- x 600 pixels. Is the monitor dying, or is the video card?
I dont have another PC to test.
John

Excuse me!!
Would you stop for a moment?!
O...man...Haven't you thought-one day- about yourself ?
Who has made it?

I've just pulled a solar garden light apart and the LDR is connected
to the little LED board with single wires shrouded in a loose cloth
type of insulation. I want to separate the LEDs from the solar panel.
The LEDs being inside the house, and the PV panel including LDR being

My proprietary camera batteries don't last long when new and as I'm not a
photography enthusiast I find, when the camera does come out, the batteries
have discharged to the point of not taking a charge.
My cunning plan is an external battery pack of standard (cheaper and higher