Elenco Projects 306-511 - Manual (Page 36)

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Project #396 Flashing 8
OBJECTIVE: Use the Alarm IC as a switch to flash the number “8”.
Turn on the slide switch (S1) and the number 8 starts flashing. The
segments are powered by connecting them to the IC’s (U2) output.
Flashing 8 with Sound
OBJECTIVE: To build a circuit so you can hear and see the 8 flash.
Use the circuit in project #396. Connect the speaker (SP) across
points X & Y to see and hear the IC’s (U2) output.
Project #397
Project #398
Turn on the slide switch (S1) and you hear space war sounds as the
lamp (L1) flashes. If you wave your hand over the photoresistor (RP),
the sound changes. If you keep the photoresistor covered, then the
sound will stop.
Press the press switch (S2) and you will hear music in addition to any
space war sounds that are playing. Press the press switch again to
change the music. You will also hear any recording you had made
previously with other projects.
Replace the lamp with the 100 Ω resistor (R1) to reduce the loudness.
Musical Space War
OBJECTIVE: To combine the sound effects of the recorder and
space war integrated circuits.