Elenco Deluxe Snap Rover&reg - Manual (Page 24)

-23-
Project #23 Flickering Metronome
Project #22
OBJECTIVE: To learn about metronomes.
Electronic Metronome
Build the circuit and connect the jumper wires as
shown. Turn on one of the slide switches (S1) and
adjust lower knob on the sound & recording IC (U9).
The left switch adds the 100 μ F capacitor (C4N) to
the circuit, which regulates the sound to be a slow
clicking. The left switch adds the smaller 1
μ F
capacitor (C7) to the circuit, giving a much faster
clicking. If the U9 knob is set so the clicking is fast,
the sound appears to be a continuous tone.
When the circuit is clicking about once a second
then it feels like the “beat” of a song. It is like a
metronome, which is used to keep time for the
rhythm of a song.
OBJECTIVE: To learn about metronomes.
R
O
VER REAR
This is a metronome like the preceding circuit; it
makes a clicking sound. Use the lower knob on the
sound & recording IC (U9) and the left slide switch
(S1) to adjust the click rate. The white LED (D4) is
also flickering at the same rate; you may need to
look closely at it to see the light.
R
O
VER REAR
+