Elenco Snap Circuits® Deluxe Sound & Light Combo - Manual (Page 127)

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Project 272 Oscillator
This circuit is an oscillator, because it
produces a repetitive electrical signal on its
own. You hear it as sound waves from the
speaker. The signal is produced by a circuit
inside the keyboard module, but may be
controlled using your Snap Circuits ®
resistors and capacitors, and the keys on
the keyboard. The keys are actually
connecting different resistors inside the
keyboard, similar to the 5.1kW resistor (R3).
Project 273
Oscillator (II)
Project 274
Oscillator (III)
Project 275
Oscillator (IV)
Project 276
Oscillator (V)
Use the preceding circuit, but replace the 1mF
capacitor (C7) with the 0.1mF capacitor (C2). Do
you hear anything? The circuit is producing a
high frequency tone, which may be too high for
your ears to hear, especially if you are older.
Now remove the 0.1mF capacitor from the
circuit. This makes the tone even higher
frequency, and you probably won’t hear
anything now. Dogs have better high frequency
hearing, so maybe your dog can hear it.
Use the preceding circuit, but replace the 100mF
capacitor (C4) with the 470mF capacitor (C5).
The clicks are now farther apart.
Use the preceding circuit, but replace the 5.1kW
resistor (R3) with the 100W resistor (R1). The
frequency of the sound is higher now, and you
hear several clicks a second.
Use the preceding circuit, but replace
the 1mF capacitor (C7) with the 100mF
capacitor (C4). The frequency of the
sound is now so low that you just hear
a clicking sound.
Use the preceding circuit, but replace
the 0.1mF capacitor (C2) with the 1mF
capacitor (C7). The frequency (pitch)
of the sound is lower now.
Build the circuit, and turn the slide switch
(S1). You hear a tone. You can also press
keys on the keyboard (U26) to change the
sound.
Project 279
Oscillator (VIII)
Project 277
Oscillator (VI)
Project 278
Oscillator (VII)
Use the preceding circuit, but replace the 470mF
capacitor (C5) with the 100mF capacitor (C4).
The clicks are faster now.
Use the preceding circuit, but replace the 100mF
capacitor (C4) with the 1mF capacitor (C7). The
frequency of the sound is much higher now, and
you hear a continuous tone.
SCC-350_Manual_Part_C.qxp 7/25/14 2:10 PM Page 15