Snap Circuits K-24 Manuale Utente

150 W. Carpenter Avenue

Wheeling, IL  60090

(847) 541-3800

http://www.elenco.com

e-mail: elenco@elenco.com

1. The Whooper Alarm has ___________ oscillators.

2. The low frequency oscillations are generated by transistors __________ and __________.

3. The high frequency oscillations are generated by transistors __________ and __________.

4. When the power is first turned on, the voltage at the base of Q2 is ___________.

5. When the power is first turned on, the voltage across C1 is ___________.

6. Capacitor C1 charges through resistor _______ and discharges through resistor __________.

7. The charge to discharged ratio on C1 is ___________.

8. Capacitor C3 causes transistor Q3 and Q4 to _____________.

9. The frequency of oscillation of Q3 and Q4 is about ____________ cycles per second.

10. The speaker is driven by transistors ________ and ________.

1) two;

2) Q1, Q2;3) Q3, Q4;

4) 5.4V;

5) zero;

6) R2, R8;7) 22:1;

8) oscillate;9) 1,000;

10) Q4, Q5