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34
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 59
The two transistors act
as an electronic device
called an SCR (Silicon
Controlled Rectier). An
SCR is a three-pin device
that once its control pin
is triggered, remains
on until the current ow
through it stops.
Project 61
Build the circuit as shown and turn on the switch (S1). The color LED (D8) is
used to control the strobe IC (U23), producing unusual effects.
Use the preceding circuit, but replace the 100W resistor (R1) with the
color LED (D8) or the red LED (D1).
Project 60 Stuck On Lights
Use the preceding circuit, but
replace the color LED (D8) with the
100kW resistor (R5) or the 5.1kW resistor (R3).
Project 62 Light & Sound
Repeat projects 61 & 62 but replace the speaker with the motor (M1)
and glow fan (motor “+” toward S1).
Project 63 Light & Motion
!
WARNING: Moving parts. Do not touch the fan or
motor during operation. Do not lean over the motor.
Funky Light & Sound
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