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92 May 2009
I would like to get information on
Mylar speakers and their theory of
operation. I need to replace a Mylar
speaker installed in a Panasonic cordless handset telephone. Can a regular
dynamic speaker replace a Mylar?
#5091 James Brendage
PIR Motion Detector
I purchased an inexpensive PIR
motion detector and did not notice it
said "for incandescent only" in small
print. It works great with an incandescent lamp, but not well with an inductive load such as a relay or fluorescent
lamp. Is it feasible to alter one of these
to operate other loads? If so, how?
#5092 Steve Gunsel
DC Power Transformer Question
I have five table-top water fountains
which I want to run constantly. They are
designed to use two AA batteries for
each fountain, which is impractical.
1. What plug-in DC power
transformer (voltage and amps) can I
substitute for the 10 batteries to power
all five devices?
2. How should it be wired — in
series or parallel?
[#1093 - January 2009]
I would like to feed the modulated
video output from my DVD player to a
SVGA video monitor. Other than
stripping the modulation from the
signal, I'm not sure what to do next.
A typical DVD player has composite video output on an RCA jack
mounted on the back. You can use a
composite video to VGA converter to
display on your SVGA monitor. Search
on "composite video converter, 40-889"
to locate the model I looked at. A less
expensive model can be found by
searching for "Ultra Small Video to
VGA Converter." Omit the model
number to locate other models. The
adapter box contains enough circuitry
to require an included wall-wart power
supply. The 40-889 converter has a FM
BNC video input. So, you need an M
BNC to RCA adapter, along with an
RCA jumper cable from the DVD
player to the adapter to the 40-889
converter. The 40-889 VGA output will
drive your SVGA monitor.
[#1096 - January 2009]
I have a LEADER Model 300
DMM/scope with logic analyzer. I need