SNAP CIRCUITSTM - Carl's Electronic Kits

Project #216
Motor & Lamp by Sound
Turn the switch on, the motor spins and the lamp lights. As you move
your hand over the photosensitive resistor, the motor slows. Now
place finger onto of the photosensitive resistor to block the light. The
motor slows down. In a few seconds, the motor speeds up again.
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Project #217
Fading Siren
OBJECTIVE: To produce
sound of a siren driving away
Press the switch (S2), the integrated
circuit should make the sound of an
up-down siren that gets weaker with
time. The fading is produced by the
charging of the 470µF capacitor (C5),
After it is charged the current stops
and the sound is very weak.
To repeat this effect you must release
the press switch (S2), remove the
capacitor (C5), and discharge it by
placing it across the snaps on the
bottom bar marked A & B. Then,
replace the capacitor (C5) and press
the switch again.
Project #218
Fast Fade
Siren
OBJECTIVE: To produce
sound of a siren driving
Replace the 470µF capacitor
(C5) with the 100µF capacitor
(C4), the siren fades faster.