Manual

-21-
Build the circuit and turn on the slide switch (S1), you hear a high-
frequency tone. Press the press switch (S2) to lower the frequency by
increasing the capacitance in the oscillator. Replace the 0.1μF
capacitor (C2) with the 10μF capacitor (C3, “+” on the right) to further
lower the frequency of the tone.
Project #539
OBJECTIVE: To make different tones with an oscillator.
Electronic Sound
Project #541
OBJECTIVE: To make a blinking light.
Lighthouse
Build the circuit and turn on the slide switch (S1), the LED (D1) flashes
about once a second.
You can also change the frequency by changing the resistance in the
oscillator. Replace the 100KΩ resistor (R5) with the 10KΩ resistor
(R4), place the 0.1μF capacitor (C2) back in the circuit as before.
OBJECTIVE: To make different tones with an oscillator.
Electronic Sound (II)
Project #540
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