MMSTA70 by Motorola, or a 2.5 volt,
0.5% voltage reference
LM4040C1M3-2.5 made by Micrel!
#3 The SMD Codebook
smd/ smdcode.htm) is a reference
for surface mount device
semiconductor device codes,
equivalents, and connections. To
identify a particular SMD device, first
identify the package style and note
the ID code printed on the device.
Now, look up the code in the
alphanumeric listing that forms the
main part of this book by clicking on
the first character shown in the left-hand frame on the website. A
scrollable page of data will appear in
the main frame.
Unfortunately, each device code
is not necessarily unique. For
example, a device coded 1A might be
either a BC846A or an FMMT3904.
Even the same manufacturer may
use the same code for different
devices! If there is more than one
entry, use the package style to
differentiate between devices with the
same ID code.
[7044 - July 2004]
What is the easiest way to
allow my computer to operate 120
VAC motors and lights?
#1 The simplest way to use a
computer to operate 110 volt devices
is through the use of X- 10 devices.
These are available from many
sources and one with the best
assortment is Smarthome (www.
smarthome.com). RadioShack also
has some units.
There are a variety of interface
units and software that operate
through either a serial or USB port.
The signals are sent over the house
wiring so that the items to be
controlled need not be near the
Some interface units allow
programmed sequences of controls
to be stored and eliminate the need
for the computer to be on for the
sequences to run; you can set up a
sequence of lights that go on and off
while you are away or you can control
your sprinklers. Use is only limited by
Deer Lodge, MT
#2 A partial solution to your
problem was described by Ryan
Sheldon ( www.nationalcontrol
devices.com) in the February 2002
issue of Nuts & Volts Magazine. His
system is based on a small chip that
connects to your computer's serial
port and a pair of servo motors. That
will allow control of tilt and pan on
one camera. According to the article,
the system is expandable to 256
devices from one serial port.
Depending on your camera, it may be
possible to use an additional chip and
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