Elenco Projects 306-511 - Manual (Page 42)

-41-
Project #425
OBJECTIVE: To light the LED’s using the recording IC.
The recording IC (U6) lights the LED’s (D1 & D2) instead of driving the
speaker (SP). Press the press switch (S2) once. The LED’s light and
then turn off after a while. Press the press switch again and see how
long the second song plays. When the second song stops, press the
press switch (S2) again to play the third song.
LED Music
Project #426 Project #427
OBJECTIVE: Show variations of project #425.
Light-controlled LED
Time Delay
OBJECTIVE: Show variations of project #425.
Touch-controlled LED
Time Delay
Use the circuit in project #425. Replace the press switch (S2) with the
photoresistor (RP). Turn the LED’s on and off by waving your hand over
the photoresistor.
Use the circuit in project #425. Replace the press switch (S2) with the
PNP transistor (Q1, arrow on U6 and a 1-snap on point F1). Turn the
LED’s on and off by touching grid points F1 & G2 at the same time. You
may need to wet your fingers.