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Project #396 Flashing 8
OBJECTIVE: Use the Alarm IC as a switch to flash the number “8”.
Turn on the 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 switch (S1) and you hear space war sounds as the lamp
(L1) flashes. If you wave your hand over the photo resistor (RP), the
sound changes. If you keep the photo resistor covered, then the
sound will stop.
Press the switch (S2) and you will hear music in addition to any space
war sounds that are playing. Press the switch (S2) again to change
the music. You will also hear any recording you had made previously
with project 386.
Replace the lamp with the 100Ω resistor (R1) to reduce the loudness.
Musical Space War
OBJECTIVE: To combine the sound effects of the recorder and
space war integrated circuits.
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