Elenco Circuit Maker Sound Plus 200 - Manual (Page 19)

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Project #16
Red & White Control
Project #17
Current Controllers
Build the circuit and turn on the
slide switch (S1), the LED (D1) will
be lit. To increase the LED
brightness, turn on the press switch
(S2). To decrease the LED
brightness, turn off the slide switch.
Project #18
Touch Light
Project #19
Speaker Static
Tap on the whistle chip and
the LED flickers. Tap again
and the LED may flicker for
a longer time. See how long
the LED will stay on.
Turn the slide switch (S1) on and
off several times. You hear static
from the speaker (SP2) when
you first turn on the switch, but
hear nothing after it is left on.
Turn on the circuit using the
slide switch (S1) and/or the
press switch (S2) and move
the adjustable resistor’s (RV)
control lever around to adjust
the brightness of the D1 and
L4. When the adjustable
resistor is set to one side,
that side will have low
resistance and its light turns
(assuming the switch on that
side is ON) on while the
other is OFF.
The speaker uses electromagnetism to create changes
in air pressure, which your ears feel and interpret as
sound. Think of the speaker as creating pressure waves
in the air just like waves in a pool. You only see waves
in the pool when you disturb the water, so the speaker
only makes sound when the voltage changes.
With the slide switch on, the 1KW
resistor (R2) controls the current.
Turning on the press switch places the
100W resistor (R1) in parallel with it to
decrease the total circuit resistance.
Turning off the slide switch places the
5.1KW resistor (R3) in series with
R1/R2 to increase the total resistance.
CM-200_Manual_031914.qxp_CM-200_Manual_031914 4/2/14 12:04 PM Page 19