Exercise 4: A crystal has these values: L, = 3 H, C, = 0.05 pF, R, = 2 k2, and C₂ = 10 pF. Calculate the f, and f, of the crystal to three significant digits. [Answers: 411 kHz, 412 kHz]
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- ad sM vunM lo livsbil A laisibul Question 3 Engineers and scientists often use eneray band diagrams to graphically illustrate ihe energy levels of electrons in different substances. Electrons are shown ds Conduction band Some metals Valence band (untiled Conduction band Other metals Overlap Valence band Energy gap Conauction band Semiconductors (intrinsic) Valence band Energy gap Conduction band alori-noitbelo Insulators Valence band solid dots: Based on these diagrams, answer the following questions: Which type of material is the best conductor of electricity, and why? 2 Which type of material is the worst conductor of electricity, and why? Question 4* In semiconductors, at room temperature the conduction band is completely empty the valence band is completely filled the valence band is partially empty and the conduction band is partially filled the valence band is completely filled and the conduction band is partially filledFind the peak value of voltage if v=25cos1600πt
- In figure 1 shows a clipper circuit made with a germanium diode. Vi(t) R 10 V Ge T/2 Vi(t) Vo(t) V = 5V -10 V - Figure 1 a) Determine the output voltage for all input voltages values. b) Sketch the output waveform, Vo(t). +WAVEFORM( NEED NEAT HANDWRITTEN SOLUTION ONLY OTHERWISE DOWNVOTE).Calculate the voltage across R2 when the voltage drop across the diodes is 0.3 Vdc. Y CRI CR2 Vs 1 R3 R4 15V 1200 3002 S R1 R2 8000 4500 15 V 12.7826 V 1.9174 V OV
- A barium titanate crystal has a thickness of 2 mm. Its voltage sensitivity is 12*10-3 Vm/N. It is subjected to a pressure of 0.5 MN/m2. What is the voltage generated ?Construct the circuit in Figure 1 without the capacitors. Use R1 = 1kohm. Adjust the value of R2 such that the Vout is 25% less than Vin. Table 1 Table 2 Question 1 Question 2 Vi Computed R2 R1 R2 1000/3 ohms Vo Input a 5Vpp square wave to your circuit. Sweep the frequency of the input from 100 Hz to 10kHz Frequency (Hz) Vout (Vpp) 100 500 1000 5000 10000 What did you notice when changing the frequency? How does the frequency affect the output of your circuit? Try changing the value of R2. What happens when you increase R2? When you decrease?A diode has IS = 10−17 A and n = 1.05. (a) What is the diode voltage if the diode current is 70 μA? (b) What is the diode voltage if the diode current is 5 μA? (c) What is the diode current for vD =0 V? (d) What is the diode current for vD =− 0.075 V? (e) What is the diode current for vD =−5 V?
- True or False: A diode can be used as a voltage source.**Experiment No. 6: Comparator Circuit َ1- If the voltage reference is in the middle of the sine wave form, it mean that the output will be : a ) square wave b ) still sine wave c ) triangle waveform 2- if the voltage reference is greater than voltage voltage input, the output will be: A) negative output B) positive output 3- The voltage reference is 5V and the voltage input is 1vp-p, the signal is ? a) always in positive output b) always in negative outputCalculate the voltage across R2 when the voltage drop across the diodes is 0.3 Vdc. CR1 CR2 E Vs Š R3 1202 S R4 15V 3002 2 R1 2 R2 8000 4502 А 15 V O V 1.9174 V 12.7826 V