Electronics Forum / Electronics / October 2004

I have a project in mind based around a cordless doorbell.
The receiver is powered from 4.5v.
I would like to use a 12v 1.2Ah rechargeable battery to power
the receiver, and need a 4.5v regulator that uses very very

Do you like to record songs off the radio? Earlier this year I discovered you
can connect your stereo to your computer's Line-in and record MP3's off the
radio. Since learning this I have had my computer record 24/7. There's so many
things recorded I still have lots to sort through! ...

Just curious, were Stereo CD's encoded as L and R (like in phonograph) or L+R
and L-R (like in radio transmission)? My guess is L and R, because by the time
CD's were around everything was stereo. How about quadraphonic CD's? I think
they had the extra channels modulated on an ...

I have a portable electronic navigation system - a Pilot III from Garmin- which
I use to find my way around the counties in the state where I work. It operates
via batteries or by pluging it into the cigarette lighter.
While using the navigation system, the batteries exploded. As I ...

  I am in need of a service manual for a Phillips Turbo Drive VCR
  Model  VR456/75 .
  Apparently a tape got stuck and owner has removed it himself now
  tape will load but wont play , doesnt seem to be winding back onto the

I have a device that uses 6 AA Batteries at one time. One of the dual coil
battery contacts is missing. Does anyone know where I can get a replacement?
I've tried Radio Shack and a hardware store and they didn't have one. Thank
you.

Found a interesting website to seach for electronics manufacturer, mostly in
Asia
http://www.globalsources.com/gsol/GeneralManager?&catalog_id=2000000003844&desig
n=clean&language=en&action=ReMap&where=GoHome
cheers

Does anyone know whereabouts in Melbourne I can buy tinning solution powder
for PCB's?
Charles L

Hi, I need to turn off a certain electronic device X hours (3-4) after i
start it. I want this to happen automatically, so I need something that
goes between the device and the power outlet, which will automatically
switch off the juice after X hours, as if the device was ...

Is there a place in modern technique for regeneration (Q-multiplication)?

I'm looking to make a steering angle sensor for my data acquisition
system in my race car. I basically need to translate the movement of
the steering wheel into voltage read by the logger unit.
The logger provides a 5v reference signal so I figured I could send

.. and I cranked up the current control to 300 mA or so.  The four are
in series and are 1700 mAh capacity.  I've seen chargers that charge the
Ni-MHs at C/10, for 15 hours.  I have another charger that charges them
in 5 hours.  So if I charge them at about C/5, should I charge them ...

    Has anyone had any experience in designing a PLD directly from a
schematic
    diagram using Protel 98 .....
    Have used Protel for schematics and autorouting creating footprints etc

Has anyone got any idea for high speed switching for power mosfets ?  a
typical mosfet has like 3,000pf gate capacitance and my driver can just
about cope with 1mhz, but 2mhz my drive wave appears like a sawtooth wave,
so the mosfets never really hit fully on or so, so they heat ...

Is there a way to hack this for free channels?