Elenco Snap Circuits SOUND ® User Manual
Page 57
Project 99
Adjustable Oscillator
Project 100
Adjustable
Oscillator
(II)
Project 101
Adjustable
Oscillator
(III)
Project 102
Adjustable
Oscillator
(IV)
Project 103
Water Detector
Use the preceding circuit, but
remove the 470
m
F capacitor
(C5) from the circuit. See the
range of sounds that this
circuit can produce.
Use the preceding circuit, but
replace the 1
m
F capacitor (C7)
with the 470
m
F capacitor (C5).
You can hear a clicking sound
for a small part of RV3’s
adjustment range.
Use the preceding circuit, but
replace the 0.1
m
F capacitor
(C2) with the 1
m
F capacitor
(C7). The frequency (pitch) of
the sound is lower now.
Build the circuit, and turn the slide switch
(S1). Turn the knob on the 500k
W
adjustable resistor (RV3) to see the range
of sounds that can be produced; there will
only be sound for a small part of RV3’s
range. You can also press keys on the
keyboard (U26) to change the sound.
Build the circuit, and
initially leave the loose
ends of the red &
black jumper wires
unconnected. Turn on
the slide switch (S1);
nothing happens. Now
place the loose ends
of the red & black
jumper wires into a
cup of water, without
their snaps touching
each other. The color
LED (D8) should be
on now, indicating that
you have detected
water!
RV’s 500k
W
adjustment
range is wide, and the
oscillator circuit inside
the keyboard (U26)
won’t function over RV’s
full range. At some
settings the circuit may
function, but produce too
high of frequency for
your ears to hear.
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