Elenco Circuit Maker Sound Plus 200 - Manual (Page 58)

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Project #140
Whistle
Oscillator
Modify the preceding circuit by replacing the
speaker (SP2) with the whistle chip (WC). The
sound may not be very loud.
Turn on the slide switch (S1)
and slowly move the lever on
the adjustable resistor (RV) until
both the lamp (L4) and LED
(D1) are flashing. They will only
flash together over a narrow
range of the lever setting.
Turn on the slide switch (S1). Move the lever on the adjustable resistor
(RV) until the LED (D1) is blinking. Adjust RV to see how fast and how
slow you can make the LED blink. The LED may blink so fast that it looks
like it is on all of the time.
Project #139
Pulse Oscillator
Use the circuit from Project #138. Connect a 1-snap to E5 and G5 and
then connect the speaker (SP2) across the LED (on level 4).
Turn the slide switch (S1) on and move the lever on the adjustable
resistor (RV) until you can hear the oscillator on the speaker (SP2). The
sound will not be very loud, and you will not hear sounds at all settings
of the adjustable resistor.
Project #138 Oscillator
Project #141 Flasher
CM-200_Manual_031914.qxp_CM-200_Manual_031914 4/2/14 12:04 PM Page 58