Hand-Control Meter; Light-Control Meter; Electric-Control Meter; Sound-Control Meter - Elenco Electronics Snap Circuits Instruction Manual

Project #489
Project #490
Light-Control
Meter
OBJECTIVE: To control the circuit using
light.
Use the circuit in project 489. Replace the
switch (S2) with the photo resistor (RP). The
music IC (U1) outputs a signal, as long a light
is present on the photo resistor. The photo
resistor is like a short, connecting the pin to
the battery. Cover the photo resistor with your
hand, the resistance goes up, and the music
stops.
OBJECTIVE: To understand music deflection.
Instead of driving a speaker (SP) with the music IC (U1), you can see
it by using the meter (M2). Turn on the switch (S1) and the meter
deflects according to the rhythm of music. When music stops, press
switch (S2) once to start the music again.
Project #491
Electric-
Control Meter
OBJECTIVE: To start the circuit using an
electric motor.
Use the circuit in project 489. Place the motor
(M1) across points A & B. Turn on the switch
(S1) and the meter (M2) deflects and swings
according to the rhythm of music.
deflection stops, rotate motor to start the
music again. The voltage generated by the
motor triggers the IC again.

Hand-Control Meter

Project #492
Sound-Control
OBJECTIVE: To start the circuit by using a
speaker.
Use the circuit in project 489.
whistle chip (WC) across points A & B. Turn
on the switch (S1) and the meter (M2) deflects
and swings according to the rhythm of music.
When deflection stops, clap your hands next
When
to the speaker (SP), the music plays again.
The clapping sound vibrates the plates in the
whistle chip, creating the voltage needed to
trigger the IC.
Meter
Place the
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