Elenco Projects 1-101 - Manual (Page 22)

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OBJECTIVE: To build a circuit with
light and sound that change and repeat.
Project #39
Blinking
Double
Flashlight
Build the circuit shown on the left and turn
it on. The lamp (L1) alternates between
being on and off while the speaker (SP)
alternates between two musical tones . . .
like someone is flipping a switch, but at a
very consistent rate. Periodic signals like
this are very important in electronics.
Project #38 Periodic Sounds
Project #36 Space Battle (II)
OBJECTIVE: To show
another way of using the
space war integrated circuit.
Build the circuit shown on the
left, which is based on the
circuit in the Space War
Project #19. Turn on the
switch and you will hear
exciting sounds, as if a space
battle is raging!
The motor is used here as a
3-snap wire, and will not spin.
Project #37
Silent Space
Battle
OBJECTIVE: To show another
way of using the space war part.
The preceding circuit is loud and
may bother people around you,
so replace the speaker (SP) with
the LED (D1), position it as in
Project #32. Now you have a
silent space battle.
In the circuit at left, replace the speaker
(SP) with an LED (D1); position it as in
Project #32. The lamp alternates between
being on and off while the LED alternates
between being dimmer and brighter.
OBJECTIVE: To build a circuit with two
lights that alternate.
To learn more about how circuits work, visit www.snapcircuits.net or page 45 to find out about our Student Guides.