lab report eet 211
Ali657
Prelab6.docx
Page 1 of 2
Prelab 6 – Timers and Oscillators
1. In part 1, what should the power supply voltage, VCC, be set to?
V
2. If the output frequency of the astable multivibrator in part 1 is 1KHz, what is the period? Give your answer in milliseconds.
mS
3. The resistors which limit the saturation current through the transistors to approximately 20mA in part 1, should be what value?
Ohms
4. In part 2, what is the period of the output signal? Give your answer in microseconds.
uS
5. In part 2, how long should the output be high for each cycle of the output signal?
Give your answer in microseconds.
uS
6. In part 2, how long should the output be low for each cycle of the output signal?
Give your answer in microseconds.
7. In part 2, if a 0.047uF capacitor is used, determine R2 value required in order for the flip-flop to oscillate at 5KHz with a 70% duty cycle?
K ohms
8. In part 2, if a 0.047 uF capacitor is used with the value of R2 determined in problem 7, calculate the value of R3 required to cause the flip-flop to oscillate at 5KHz with a 70% duty cycle?
K ohms
9. What type of amplifier is displayed in part 3A?
O Common Collector
O Swamped common collector
O Common base
O Swamped common base
O Swamped common emitter
10. What type of bias is used in the amplifier displayed in part 3A?
O Collector feedback bias
O Emitter bias
O Base bias
O Voltage divider bias
11. Assuming hFE is 165 for the transistor displayed in the amplifier in part 3A, calculate VB.
V
12. Assuming hFE is 165 for the transistor displayed in the amplifier in part 3A, calculate IC.
mA
13. Assuming hFE is 165 and hfe is 120 for the transistor displayed in the amplifier of part 3A, calculate the voltage gain, AV, of the amplifier.
V/V
14. What type of oscillator is displayed in part 3B?
O Phase Shift
O Wien Bridge
O Hartley
O Collpits
15. At what frequency will the oscillator displayed in part 3B oscillate?
KHz
