Elenco Upgrade Kit SC500 to SC750 - Manual (Page 37)

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Project #577
OBJECTIVE: To learn the principle of an SCR.
SCR Solar Bomb Sounds
Set the meter (M2) to the LOW (or 10mA) scale. With the slide switch
(S1) off, make sure you have enough light on the solar cell (B2) for the
meter to read 8 or higher. Turn on the slide switch now; nothing
happens. Press the press switch (S2) and you hear an explosion of
sounds, which continues until you turn off the slide switch.
Project #578
OBJECTIVE: To build a laser sounding circuit.
Flashing Laser LED’s
with Sound
When you press the press switch (S2), the integrated circuit (U2)
should sound like a laser gun. The red (D1) and green (D2) LED’s will
flash simulating a burst of light. You can shoot long repeating laser
bursts or short zaps by tapping the press switch.
To learn more about how circuits work, visit www.snapcircuits.net or page 85 to find out about our Student Guides.