Elenco Upgrade Kit SC500 to SC750 - Manual (Page 147)

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Build the circuit and try the settings shown. Turn it on, press the
press switch (S2) several times, and wave your hand over the
photoresistor (RP) to view all the sound combinations.
Compare
the waveform and spectrum to the alarm IC combo circuit.
Project #PC72
Space War Music Combo PC
OBJECTIVE: To view the output of the combined outputs from
the space war and music integrated circuits.
Settings
Build the circuit and try the settings shown. Turn it on and view
the waveforms.
Project #PC73
Sound Mixer PC
OBJECTIVE: To view the output of the music and alarm
integrated circuits.
Settings