Elenco Circuit Maker Skill Builder 125 - Manual (Page 28)

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Project #42
Blinking
Double
Flashlight
Project #41 Sporadic Sounds
Project #39 Space Battle Project #40
Bizarre
Blinker
Periodic electrical signals are
used for things like flashing
yellow lights or sometimes in
consumer devices to indicate
batteries are low.
Build the circuit shown on the
left. Turn on the switch (S1)
and you will hear exciting
sounds, as if a space battle is
raging!
The motor (M1) is used here
as a 3-snap wire, and will not
spin.
The preceding circuit is loud and
may bother people around you, so
replace the speaker (SP) with the
LED (D1). Make sure you connect
the LED with the positive (+) side
on A6, not U3. Now you have a
silent space battle.
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.
In the circuit at left, replace the speaker
(SP) with an LED (D1). Make sure you
connect the LED with the positive (+) side
on A5, not U1. The lamp (L1) alternates
between being on and off while the LED
alternates between being dimmer and
brighter.
CM-125_Manual_031514.qxp_CM-125_Manual_031514 4/2/14 12:19 PM Page 28