Project 23
Super Space War
Build the circuit shown on the left. Activate it by
flipping the slide switch (S1) or pressing the
press switch (S2); do both several times and in
combination. You will hear an exciting range of
sounds plus light, as if a space war is raging!
Use the preceding circuit, but
replace the slide switch (S1)
with the phototransistor (Q4),
with “+” toward U3. The circuit
immediately makes noise
(unless the room is vary dark),
and the color LED (D8) lights.
Cover and uncover the
phototransistor to change the
sound, or push the press swtch
(S2). Do both several times and
in combination.
Project 24
Super Photo
Space War
Project 25
Quieter Super
Space War
This circuit is just like project 23, but not as
loud. Activate it by flipping the slide switch
(S1) or pressing the press switch (S2); do
both several times and in combination.
Use the preceding circuit, but
replace the slide switch (S1)
with the phototransistor (Q4),
with “+” toward U3. The circuit
immediately makes noise
(unless the room is vary dark),
and the color LED (D8) lights.
Cover and uncover the
phototransistor to change the
sound, or push the press swtch
(S2). Do both several times
and in combination.
Project 26
Quieter Super
Photo Space War
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