Electronics Forum / Basics / September 2004

Dear Reader,
I'm looking for information (quotation for production quantity's)
for a little chip in a toy.
The only thing that this chip has to do is pick a RANDOM number (10th of a

Anny one knows where to find good tutorials to start learning FPGA
(Article, web site, free simulation software ...)
Thanks
ps : i'm an electronic engineer (control design)

Hello all. I am fairly new to the world of digital electronics, and to get
me started, I am building a digital clock out of CMOS 4000 series logic ICs.
The schematic for the clock can be seen at the following URL:
http://elektronik.kai-uwe-schmidt.de/digital_uhr_en.php. Now, that ...

I need to know how to set the pins on a Divide-By-N counter either High or
Low on a PCB.  Also is "1" and "0" the same as high and low?
Can anyone help me?

  How would I construct an XOR function using NOR gates ONLY? I have
tried breaking my head over it but haven't come up with a solution.
  Thanks in advance
Rakesh

Help!
Shot noise, as stated in Horowitz&Hill, ch7.11, p.432, shows a noise current
of
Inoise(rms) = sqrt(2*q*Idc*B)

I am trying to construct a simple device for turning on and off three lights
(one at a time).  I have a traffic light that was blown down during a recent
hurricane (obtained from the road dept.).  It's frame was too damaged to put
back up, but the lights work great.  I would like ...

For a very long time I have been using a DOS pcb program which used to
work great with my hp Deskjet which worked off the parallel port.
When that printer dies I got a new one that works off the USB. No

I need to build a board with painted animals( got it) with led eyes that light
up at night. I've tried to wire it up, but the led bulbs keep burning out. I am
using a 9 voltbattery. Any wiring suggestions?

I'm looking for a solution to switch two audio channels. The channels
are in the range of 0..3V and 0..-3V. The distortion should be < 0.03%
and crosstalk  < 90dB.
Ch0+ ---

http://www.geocities.com/smpaladin/circuit1.gif
This is what the above circuit is supposed to accomplish:  As long as
a magnet is held above the hall sensor, it will turn on the coil.  It
does that by utilizing a power transistor.

Any suggestions for a sensitive thermistor or otherwise to act as a blow
sensor, dont really need a calibrated or accurate response, just detect the
presence or otherwise of  a short pulse of moving air, like someone blowing
across something.

Chistmas doesn't seem too far away and time for me to dust off my trusty
soldering iron and knock together some christmas lights.
I want to build something original and catchy using just LED's in some form
of display. If I want something a little unconventional, is there a project

I am working on a project. And I have two elements which take power
from two different AC to DC power converters. In this case it is an
LCD Display and a DC to DC power converter for a small computer. The
display is expecting 12v 3A and the DC to DC converter is expecting

I get the naming difference - what are the different uses for each? IE why
would one use one vs another?