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AC Line Powered LEDs - The circuit above illustrates powering a LED (or two)
from the 120 volt AC line using a capacitor to drop the voltage and a small resistor
to limit the inrush current. Since the capacitor must pass current in both directions,
a small diode is connected in parallel with the LED to provide a path for the negative
half cycle....[Bill Bowden]
AC line powers microcontroller-based fan-speed regulator - 9-Nov-06 Issue of
EDN Capacitor drops voltage, decreases waste heat in line-powered
controllers....[Design Idea by Abel Raynus, Armatron International Inc, Malden, MA;
Edited by Brad Thompson and Fran Granville]
Acceleration meter for cars - This circuit it is count the acceleration from
-1000mg up to +1000mg. Can be used in lot of applications like cars, elevators, ramps
and more.….(electronic schematic added 03/09)
AccelR8: a device for measuring acceleration - This is a fun project.
Unfortunately, it takes some time to develop the code, so this is a work in progress
and here i'll just present the project so far. Basically the AccelR8 is a device for
measuring acceleration. It can measure +/- 2 g. As it contains a microprocessor, it an
also measure time. This opens up some interesting possibilities. If we have the
acceleration and the time, we can find speed (V), as V = a * t. Also, we can find
distance (D) as D = 0.5 * a * t * t. If we now the mass of the object we are moving,
we can also find the force (F) applied, as F = m *....
