Elenco Upgrade Kit SC100 to SC750 - Manual (Page 34)

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Project #193 Light Alarm
OBJECTIVE: To build a transistor light
alarm.
OBJECTIVE: To build a simple laser.
Replace the motor (M1) with the 6V
lamp (L2). Now pressing the press
switch (S2) creates a blast of light like a
laser.
Project #196
Laser Light
OBJECTIVE: To build a brighter
transistor light alarm.
Project #195 Lazy Fan
OBJECTIVE: To build a fan that doesn’t
work well.
Press the press switch (S2) and the fan will be
on for a few turns. Wait a few moments and
press again, and the fan will make a few more
turns.
Modify the circuit in project #193 by
replacing the LED (D1) with the 2.5V
lamp (L1) and replacing the 5.1k
Ω
resistor (R3) with the 100 Ω resistor
(R1). It works the same way but is
brighter now.
Build the circuit with the jumper connected as
shown, and turn it on. Nothing happens. Break
the jumper connection and the light turns on.
You could replace the jumper with a longer wire
and run it across a doorway to signal an alarm
when someone enters.
Project #194
Brighter
Light Alarm
!
WARNING: Moving parts. Do not
touch the fan or motor during operation.
Do not lean over the motor.
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