Elenco Circuit Maker Sound Plus 200 - Manual (Page 52)

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Project #113 Whiner
Project #114
Hummer
Now place the 0.1mF capacitor (C2) above the
whistle chip (WC) and vary the adjustable
resistor (RV) again. The frequency (or pitch) of
the whine has been reduced by the greater
added capacitance and it sounds more like a
hum now.
Project #115
Adjustable
Metronome
Now place the 10mF capacitor (C3, “+” side on
right) above the whistle chip (WC) and vary the
adjustable resistor (RV) again. There is no hum
now but instead there is a click and a flash of
light repeating about once a second, like the
“beat” of a sound. It is like a metronome, which
is used to keep time for the rhythm of a song.
Project #116
Quiet Flasher
Leave the 10mF capacitor (C3) connected but
replace the speaker (SP2) with the 4.5V lamp
(L4).
Build the circuit, turn it on, and move the setting on the adjustable resistor
(RV). It makes a loud, annoying whine sound. The red LED (D1) appears
to be on, but it is actually flashing at a very fast rate.
CM-200_Manual_031914.qxp_CM-200_Manual_031914 4/2/14 12:04 PM Page 52