Elenco LIGHT - Manual (Page 54)

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Project 102 White Blinker
Build the circuit as shown,
and note that several
parts are stacked over
others. Turn on the slide
switch (S1); nothing
happens.
Now push the press
switch (S2); the motor
(M1) turns on and stays
on. The motor will stay on
until you turn off the slide
switch.
Use the preceding circuit, but replace the motor with the
red LED (D1).
Project 104
Stuck On Motor & Lights
Project 103
Low Voltage Stuck On Lights
Use the project 102 circuit but place the red LED (D1) next to
the motor at base grid locations G5-G7 (“+” to G5). Connect the
red LED to the adjacent points on the motor using the red &
black jumper wires, making sure the jumper wires do not touch
the motor or fan.
Turn on the slide switch (S1), then push the press switch (S2).
The motor spins and the red LED is dim. Turn off the circuit,
remove the fan from the motor, and turn the circuit back on. Now
the red LED is bright because it takes less electricity to spin the
motor without the fan, leaving more electricity for the red LED.
Stuck On Light
Build the circuit as shown, and note that several
parts are stacked over others. Turn on the slide
switch (S1); nothing happens.
Now push the press switch (S2); the white LED (D6)
turns on and stays on. The white LED will stay on
until you turn off the slide switch.
Project 101
Stuck On
Lights
Use the preceding circuit, but
replace the 100
Ω
resistor
(R1) with the color LED (D8)
or the red LED (D1).
!
WARNING: Moving
parts. Do not touch
the fan or motor
during operation.
Project 100
The two transistors act as
an electronic device
called an SCR (Silicon
Controlled Rectifier). An
SCR is a three-pin device
that once its control pin is
triggered, remains on
until the current flow
through it stops.
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