Elenco Snap Circuits SOUND &reg - Manual (Page 28)

This project requires stereo headphones or a stereo speaker; neither is included
with this set, but this set does include a stereo cable to facilitate connection to
your stereo speaker.
Build the circuit as shown. Connect your own headphones or stereo speaker to
the audio jack (JA). Turn on the slide switch (S1).
Press keys on the keyboard (U26) and listen to the sound on your headphones
or stereo speaker. Set the 500k
W adjustable resistor (RV3) for most comfortable
sound level (turn to the left for higher volume, most of RV3’s range will be very
low volume), and then move the lever on the adjustable resistor (RV) to vary
the amplitude to each ear.
Project 14 Keyboard in Stereo
Project 15 Optical Theremin in Stereo
Headphones or
Stereo Speaker
(not included)
In stereo, sound is produced on several
speakers with varying amplitude on each.
This gives the impression that the sound
is coming from different directions.
WARNING: Headphones performance varies, so use caution. Start with
low volume, then carefully increase to a comfortable level. Permanent
hearing loss may result from long-term exposure to sound at high volumes. !
Use the preceding circuit, but modify it by adding the photoresistor (RP) and
the parts next to it.
Press keys on the keyboard (U26) and wave your hand over the
photoresistor (to adjust the amount of light shining on it) while listening to
the sound on your headphones or stereo speaker. Set the 500k
W adjustable
resistor (RV3) for most comfortable sound level (turn to the left for higher
volume, most of RV3’s range will be very low volume), and move the lever
on the adjustable resistor (RV) to vary the amplitude to each ear. There may
not be any sound if there is too much or too little light on the photoresistor.
Close your eyes and have a friend vary the light to the photoresistor and
moving the lever on the adjustable resistor. See if you get an impression of
the sound changing direction.
WARNING: Headphones
performance varies, so use
caution. Start with low volume,
then carefully increase to a
comfortable level. Permanent
hearing loss may result from
long-term exposure to sound
at high volumes.
!
Headphones or
Stereo Speaker
(not included)
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