Elenco Snap Circuits Motion - Manual (Page 48)

Project 77 Secret Resistors
Hidden in the pivot stand are resistors, which
control or limit the flow of electrical current. The
resistance between the color LED and point C
is 10,000W (10kW), which is the same as the
highest setting in the adjustable resistor (RV2).
The resistance between the color LED and
point A is 47W, which is lower than the lowest
setting in the adjustable resistor.
Build the circuit and turn on the slide switch (S1). The color LED (D8) is
on but is not very bright.
Remove the 2-snap wire between the points marked B & C, and place
it across points A & B. Now the color LED is brighter.
Project 78
Adjustable Alarm
Sounds & Light
Project 79
Stable Adjustable Alarm
Sounds & Light
Use the preceding circuit but replace the color LED (D8) with the
red/yellow bicolor LED (D10, oriented in either direction). The circuit
works the same way, except the light color is not changing. Try the
same variants as for the preceding circuit.
Use the project 78 circuit but replace the color LED (D8) with a 3-snap
wire. The circuit works the same way, except the sound is louder and
there is no light. Try the same variants as for the project 78 circuit.
-47-
Build the circuit and turn
on the slide switch (S1).
Use the lever on the
adjustable resistor (RV2)
to change the sound
volume and light
brightness.
Variants: You can change
the sound by removing
the 1-snap and 2-snap
wires that are at point A,
or by moving them to be
across points B & C, or
across points A & D.
Project 80
Adjustable Volume Alarms
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