Elenco Electronics 202 - Manual (Page 56)

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Project #106
OBJECTIVE: To build a circuit that produces multiple space war
sounds.
Turn the slide switch (S1) to the OFF position. Press the press switch
(S2) down and a space sound will be played. If you hold the press
switch down the sound repeats. Press the press switch again and a
different sound is played. Keep pressing the press switch to hear all
the different sounds.
Next, turn the slide switch to ON position. One of the sounds will be
played continuously. Turn the switch off and then back on. A different
sound is played. Keep pressing the press switch to hear all the
different combinations of sounds.
The space war integrated circuit has “logic” built into its circuitry that
allows it to switch between many different sounds.
Space War Sounds
Project #107
OBJECTIVE: To change the sounds of a multiple space war with
light.
Modify the preceding circuit to look like the one shown on the left.
The space war IC (U3) will play a sound continuously. Block the light
to the photoresistor (RP) with your hand. The sound will stop. Remove
your hand and a different sound is played. Wave your hand over the
photoresistor to hear all the different sounds.
Press the press switch (S2) down and now two space war sounds are
played. If you hold the press switch down the sound repeats. Press
the press switch again and a different sound is played. Keep pressing
the press switch to hear all the different combinations of sounds.
Space War Sounds
Controlled By Light