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Project #206 Tone Generator
Project #207
Tone
Generator (II)
OBJECTIVE: To lower the
frequency of a tone by increasing
Place the 0.02
µ
F capacitor (C1) on top of the
whistle chip (WC) in the preceding circuit, you
hear a middle-frequency sound. Why? The
whistle chip is used here as a capacitor and
by placing the 0.02
µ
F on top (in parallel) we
have increased the capacitance, and doing so
lowers the frequency.
Project #208
Tone
Generator (III)
OBJECTIVE: To lower the
frequency of a tone by increasing
Next, replace the 0.02
µ
F capacitor and the
whistle chip with the larger 0.1
µ
F capacitor
(C2). You now hear a low frequency sound,
due to yet more capacitance.
Project #209
Tone
Generator (IV)
OBJECTIVE: To lower the
frequency of a tone by increasing
Now replace the 0.1
µ
F with the much larger
10
µ
F capacitor (C3), (orient with the positive
(+) side towards the left); the circuit just clicks
about once a second. There isn’t a constant
tone anymore due to other transistor
properties. You need a different type of circuit
to create very low frequency tones.
Build the circuit and turn it on, you hear a
high-frequency sound.
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