Elenco Upgrade Kit SC100 to SC750 - Manual (Page 113)

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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
μF capacitor (C2) with the 10μF 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 100KΩ resistor
(R5), this can be done with either the 0.1 μF (C2) or 10μF (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
μF capacitor (C1) with 0.1μF
capacitor (C2) or 10 μF capacitor (C3, “+” on the right) to change the sound.
Bee
OBJECTIVE: Show a variation of project #401.
Place the 0.02 μF 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
μF capacitor (C1) with 0.1μF
capacitor (C2) or 10 μF 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 μF capacitor (C4)
with the 10 μF capacitor (C3) or the
470 μF 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.
Visit www.snapcircuits.net or page 62 to learn about Snap Circuits ® upgrade kits, which have more parts and circuits.