Elenco Snap Circuits SOUND &reg - Manual (Page 51)

Project 74 Day Light Project 75 Lower Day Light
Build the circuit, and turn on the
slide switch (S1). Set the knob on
the 500k
W adjustable resistor
(RV3) all the way to the right. If the
room light is bright then the color
LED (D8) should be off. Cover the
photoresistor (RP) or take the
circuit into a dark room, and the
color LED should turn on.
Build the circuit, and turn on the slide switch (S1). Blow into the
microphone (X1), and hear it on the speaker (SP2).
This circuit is like the
preceding one, but
can be used in
darker rooms. Build
the circuit, and turn
on the slide switch
(S1). Set the lever
on the adjustable
resistor (RV) so the
color LED (D8) just
gets bright. Now
when you block the
light to the photo-
resistor (RP), the
color LED will turn
off.
Build the circuit, and
turn on the slide
switch (S1). Set the
lever on the
adjustable resistor
(RV) so the color
LED (D8) just gets
bright. Now when
you block the light to
the photoresistor
(RP), the color LED
will turn off. If the
color LED cannot be
turned on or off at
any RV setting, then
change your room
lighting.
Project 76 Dark Light Project 77 Blow Noise
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