Electronics Forum / Design / February 2006

Roger Maynard the cordially, as always troll (AKA Realto Margarino,
Ronald Matthews) exposed:
Here is Roger Maynard's very first post, with his sig showing who he is:
http://

I'm designing a power supply which uses a transformer, Full wave bridge
rectifier, capacitor and an inductor.  Is there any reason why I should
use an inductor and a capacitor rather than just a capacitor.
Jimmy

I need a simple circuit, so I ask you the simpliest way to do it :)
All I need to do is this. I have a Vin of 9volts (battery), I need to
have a Vout=Vin for a few milliseconds (or even a few seconds is fine)
and then Vout=0. So the goal is: when you connect the battery Vout=Vin

What is the effective dielectric constant for a parallel-plate
constructed as follows:
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I need some help in building a 12V dc power supply.  I can find lots of
documentation on building one from scratch and selecting a transformer for
the initial AC supply voltage, but this is my problem.  I wish to impliment
this 12 Vdc into an audio amplifier and draw from its ...

I have a question, I'll be honest, I have no knowledge of electronic
seeing as how I haven't taken anything in it since College and tha
was 4 years ago
My question is, and hopefully someone can answer it, I have

I thought it was facinating how well I've seen identical Led's even
up the voltage current spread. I have made two arrays. One of 16
small Led's, and one of 9  5 watt Led's. The last one is 45 watts.
One inch square. I can see how the high current can equalize through

I need to design an amplifier that takes in a differential signal (call
these inputs A and B), adds a bias C (where this signal is referenced
to amplifier's ground), and applies a high gain (G ~= 100). In other
words:

I need some help in building a 12V dc @ 600 ma power supply.  This will be
used to power a LCD back light.  The source of the power will be comming
from an audio amplifers +-38Vdc supply as measured right after the full-wave
recitifer diodes.

I'm seeking out a new PCB design package, and have been pointed to look
at Altium Designer from someone in the group.
On (digital!) paper, it looks excellent, ideal in fact.
But I would like to hear from real users, as our current system

Is this Epson controller still in production.
Is there an Epson eb link where I can look at the status and pack sizes etc.
Regards
Joseph

I'm looking for some low-cost Bluetooth modules for the ability to easily
add Bluetooth capability to some of my designs.  I suppose something under
$20 would be acceptable.  I need the module to be self contained--just
solder onto the board and communicate to it with a micro.  I ...

I just got a FM transmiter module from supplier, after my test, its
every channel occupy almost 0.5MHz of range.
For example, when I tune to 100MHz, I can hear it from 99.7MHz~100.2MHz
and only 99.7MHz didn't show "Stereo" tag on screen, others (

I am an undergrad student at electric and electronics engineering.I
have a course project at analog electronics which is to make an
electronic faucet with photo transistors.I have an idea how to operate
while hands come close but i don't have an idea how to control the

To save a few $, I am considering building a homemade XGA projector system
using an overhead projector and an LCD monitor.  Details are here:
http://www.denguru.com/2004/11/13/supersize_your_tv_for_/
My purpose would be to use it in a high school classroom, for ppt