Elenco Christmas Tree Kit User Manual
Page 8
QUIZ
1. The main component of the Electronic Christmas Tree is the ___________ IC.
2. There are __________ 555 timers used in our circuit.
3. The LED lights when _______ appear across the LED and its resistor.
4. When the output of the 555 IC is high, the ___________ LEDs will light.
5. When LED D2 is lit, LED D1 is __________.
6. Lowering the value of R2 will _____________ the time that the LEDs will be ON.
7. The frequency of oscillation is determined by the values of R1, R2 and __________.
8. The duty cycle is determined by the values of R2 and _________.
9. The combinations of R1, R2 and C1 is called an RC _____________ constant.
10. Capacitor C2 is added to ____________ the circuit.
Answ
ers:
1. 556;
2. f
our; 3.
9V; 4.
green;
5. off;
6. decrease;
7. C1;
8. R1;
9. time;
10. stabiliz
e
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