-43-
Project #63
OBJECTIVE: To show all the features of the sound & recording IC.
Lunar Messenger
Build the circuit as shown on turn off the slide
switches (S1). You should hear a two-tone sound (it
may be preceded by a recording); use both knobs
on the sound & recording IC (U9) to change it.
Removing the 2-snap wire at the point marked
should also change it.
Replace the 3-snap wire with the 100
μ
F capacitor
(C4N); the tone should be different. Add the 1
μ
F
capacitor (C7) across the points marked & ,
the sound should not be as loud now. Turn on the
lower slide switch; this should shut off the sound
completely.
Turn on the upper slide switch and talk into the
microphone (marked “MIC” on U9) to record a
message; turn off the switch when finished. Push
the press switch (S2) to play the message you
recorded.
R
O
VER REAR
B
A
C
A
B
C
Parts to add later:
Summary of Contents for SCROV-50
Page 47: ...46 Notes...
