Elenco Projects 306-511 - Manual (Page 37)

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Project #399
OBJECTIVE: To make different tones with an oscillator.
Build the circuit and turn on the slide switch (S1), you hear a high-
frequency tone. Press the press switch (S2) and move the adjustable
resistor (RV) control around to change to frequency of the tone.
Replace the 0.1
μ F capacitor (C2) with the 10 μ F capacitor (C3, “+” on
the right) to lower the frequency of the tone.
Electronic Noisemaker
OBJECTIVE: To show a variation of project #399.
You can also change the frequency by changing the resistance in the
oscillator. Replace the 10K
Ω resistor (R4) with the 100K Ω resistor
(R5), this can be done with either the 0.1 μ F (C2) or 10 μ F (C3)
capacitors in the circuit.
Electronic Noisemaker (II)
Project #400
Project #401
OBJECTIVE: To make different sounds with an oscillator.
Build the circuit and press the press switch (S2) a few times, you hear cute
sounds like a bumble bee. Replace the 0.02
μ F capacitor (C1) with 0.1 μ F
capacitor (C2) or 10 μ F capacitor (C3, “+” on the right) to change the sound.
Bee
OBJECTIVE: Show a variation of project #401.
Place the 0.02 μ F capacitor (C1) back in the circuit.
Remove the speaker (S1) from the circuit and place
the whistle chip (WC) across the transformer (T1)
at points labeled A & B on the circuit layout. Listen
to the sounds as you press the press switch (S2).
Replace the 0.02
μ F capacitor (C1) with 0.1 μ F
capacitor (C2) or 10 μ F capacitor (C3, “+” on the
right) to change the sound.
Bee (II)
Project #402
Bee (III)
Project #403
OBJECTIVE: Show a variation of project #401.
Replace the 100 μ F capacitor (C4)
with the 10 μ F capacitor (C3) or the
470 μ F capacitor (C5) to change the
duration of the sound. Use either the
speaker circuit in project #401 or the
whistle chip circuit in project #402.
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