Elenco Snap Circuits Motion - Manual (Page 71)

Project 144 Finger Touch Light
Set the adjustable resistor (RV2) to the top position, and turn on the
slide switch (S1). Turn on the red/yellow bicolor LED (D10) by touching
your fingers between points A & B. You may need to press hard or wet
your fingers to make the LED bright.
You can adjust the LED brightness using the lever on RV2, or replace
the red/yellow LED with the color LED (D8).
Project 145 Slow Off Light
Set the switcher (S6) to
the top position and turn
on the slide switch (S1).
The red/yellow bi-color
LED (D10) is on. Now set
S6 to the middle position
and wait; the LED goes
off after a little while. The
adjustable resistor (RV2)
can adjust how quickly
the light goes out.
Project 146
3-Position Switch
-70-
Electricity flowing through
your fingers is amplified by
the NPN transistor (Q2), and
is enough to turn on the LED.
If the contacts at points A & B
were interweaved as shown
below then you could make
this work with just one finger.
The switcher (S6), has 3 positions. In this circuit, one
position turns on the red/yellow LED (D10), one turns on
the color LED (D8), and one turns both LEDs off.
You can change the color on D10 by reversing its orientation.
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