@▷ UNPLUGGED POWER CORD ALARM | Diagram for Schematic

UNPLUGGED POWER CORD ALARM


UNPLUGGED POWER
CORD ALARM…[more]

Many medical
devices, such a
portable X-ray
and ultrasound
equipment, carry
their own
batteries.
However, the
frantic pace of
some hospital
emergency rooms
might cause the
device to be
shoved off into
a corner without
being plugged
back into an AC
power source to
recharge their
batteries. So, I
designed this
circuit to emit
an audible alarm
whenever the
device’s power
cord was
unplugged from
the wall for a
period of time.
The device was
designed to snap
onto the outside
of a power cord,
where it senses
the AC electric
field emitted.
No direct
connection to
the internal
wires of the
power cord is
needed. I also
included a low
battery voltage
monitor.

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