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Baby Paws
11 December 2001
Submitted By: Mark
McCall
(Photo on NEWS page)
I have received some info
from
Ian Bird on his "Baby Paws (pause)" timer circuit...
"In brief: This small, 2 ¼” by 1”
circuit board is
based on a 555 timer chip and a resistor/capacitor combination. It can
output a
positive (+ve) signal and provide a switched ground for a short time period
after being triggered. The trigger can be either a +ve feed or a ground
connection. The delay is adjustable using a small screwdriver between
milliseconds to more than 10 seconds. Changing two components can make this
delay a lot longer, minutes or even hours or days.
Specs
Ø Operates using a voltage of between
5
and 15 volts.
Ø Polarity protection (optional).
Ø Facility for
onboard
voltage regulator (optional).
Ø Trigger from either a +ve voltage or
ground.
Ø Will output a +ve signal (max 100ma) on triggering.
Ø Will
supply a ground (max 100ma) on triggering.
Ø Delay adjustable from
almost
nothing to 10 seconds or more."
Ian's site will be up in the future detailing
this
and his other projects.
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