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