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

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Wheeling, IL 60090

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