Elenco Upgrade Kit SC500 to SC750 - Manual (Page 34)

-33-
Project #569
OBJECTIVE: To build a sun-powered oscillator circuit.
Low Light Noisemaker
Project #570
Low Light Noisemaker (II)
OBJECTIVE: To build a sun-powered oscillator circuit.
Use the circuit from project #569 but replace
the whistle chip (WC) with the 0.1
μ F
capacitor (C2) to lower the frequency of the
sound. The circuit works the same way.
OBJECTIVE: To build a sun-powered oscillator circuit.
Project #571
Low Light Noisemaker (III)
Set the meter (M2) to the LOW (or 10mA) scale. With the slide switch
(S1) off, make sure you have light on the solar cell (B2) for the meter
to read at least 5 but less than 10.
Turn on the slide switch and it should make a whining sound, adjust
the amount of light to the solar cell to change the frequency of the
sound. Use a brighter light or partially cover the solar cell if there is no
sound at all.
Use the circuit from project #569 but replace
the whistle chip (WC) with the 10
μ F capacitor
(C3, “+” on the right) to lower the frequency of
the sound. The circuit works the same way
but you hear a ticking sound instead of a
whining sound.
To learn more about how circuits work, visit www.snapcircuits.net or page 85 to find out about our Student Guides.