Elenco Projects 102-305 - Manual (Page 39)

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Project #210
OBJECTIVE: To build a middle-frequency oscillator.
Build the circuit, as the name suggests this circuit is similar to that in
project #206. Turn it on, you hear a middle-frequency sound.
More Tone Generator
OBJECTIVE: To lower the frequency of a tone by increasing
circuit capacitance. OBJECTIVE: To lower the frequency of a tone by increasing
circuit capacitance.
Now place the 10 μ F capacitor (C3) on top of the whistle chip (WC). You
hear a clicking sound as the LED’s blink about once a second.
Place the 0.02 μ F capacitor (C1) or the 0.1 μ F capacitor (C2) on top of
the whistle chip (WC). The sound is different now because the added
capacitance has lowered the frequency. The LED’s appear to be on, but
are actually blinking at a very fast rate.
Project #211
More Tone
Generator (II)
Project #212
More Tone
Generator (III)