Elenco Snap Circuits SOUND &reg - Manual (Page 69)

Build the circuit (note that there is a 4-snap wire under Q2, partially
hidden) and turn the slide switch (S1). Press any key on the keyboard
(U26) and set the 500k
W adjustable resistor so the sound just shuts off.
Now block the light to the photoresistor (RP) and press some keys to
play tones.
Build the circuit (note that there is a 4-snap wire under Q2, partially
hidden) and turn the slide switch (S1). Press keys on the keyboard
(U26). This keyboard only works during the day, so you have to have
light on the photoresistor or there won’t be any sound. If you cover the
photoresistor or place the circuit in a dark room then it won’t work. If the
light is dim then the sound may be abnormal.
Project 141 Day Keyboard
Project 142 Night Keyboard
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