Elenco Electronics SNAP CIRCUITS SC-300 - Hissing Foghorn; Hissing & Clicking; Video Game Engine Sound

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Project #190
OBJECTIVE: To build a transistor oscillator that can
Hissing Foghorn
Project #191
Hissing & Clicking
Modify the circuit in Project 190 by replacing
the 100kΩ resistor (R5) with the
photosensitive resistor (RP).
Move the adjustable resistor setting until you
hear hissing sounds, and then shield the
photosensitive resistor while doing so and
you hear clicking sounds.
Build the circuit on the left and
move the adjustable resistor
setting. Sometimes it will make a
foghorn sound, sometimes it will
make a hissing sound, and
sometimes it will make no sound
at all.
Project #192
Video Game Engine Sound
Remove the photosensitive resistor (RP) from
the circuit in Project 191 and instead touch
your fingers between the contacts at points
A4 and B2 on the base grid while moving the
adjustable resistor. You hear a clicking that
sounds like the engine sound in auto-racing
video games.