Elenco Electronics 202 - Manual (Page 117)

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Project #274
OBJECTIVE: To make a fading sound.
Turn on the slide switch (S1), you hear music that fades away as the
470
μF capacitor (C5) charges up. Push the press switch (S2) to
discharge the capacitor and make the sound loud again.
Fading Music Sound
Project #273
OBJECTIVE: To make a fading sound.
Turn on the slide switch (S1), you hear a bomb sound that fades away as
the 470
μF capacitor (C5) charges up. Push the press switch (S2) to
discharge the capacitor and make the sound loud again.
Fading Bomb Sound
Project #275
Fading Music Sound (II)
OBJECTIVE: To make a fading sound.
Use the circuit from project #274 but replace the speaker (SP) with the
red LED (D1), positive (+) side up. Turn on the slide switch (S1), the
LED flashes for a few seconds and goes dim. Push the press switch
(S2) to discharge the capacitor and make the LED flash again.