ENEL500 Analog electronics

For the circuit shown below, (a) find the Thevenin equivalent voltage and impedance for the network to the left of terminals a, b, and (b) use the Thevenin equivalent circuit to determine the current through the load resistor RL 2.For the circuit shown below find the Thevenin equivalent for the bridge circuit as seen by the load resistor RL between the points A and B.Calculate and draw the current waveform through RL in the circuit shown below assuming D1 and D2 are ideal (0 voltage drop across the diode and 0 resistance in forward bias and 0 current in reverse bias). Also, R2 = RL = 100 ohms and Vs is a 10 V peak square wave of period 1 ms.

4.Inthe circuit shown below, D1 and D2 are ideal diodes (0 voltage drop across the diode and 0 resistance in forward bias and 0 current in reverse bias). Find the diode currents ID1 and ID2 5.A bridge circuit rectifier is shown below. Assume that the diodes are ideal (0 voltage drop across the diode and 0 resistance in forward bias and 0 current in reverse bias). a)With the switch SW open the DC value of the output voltage is 24 V. Calculate the output DC current, transformer turns ratio and the peak inverse voltage of the diode. b)The switch SW is now closed. What is the DC value of the output voltage? Calculate the value of filter capacitance such that the output ripple is no more than 5% of the DC output voltage.  6.For the voltage divider bias circuit shown below, determine the DC operating point (IC and VCE) assuming a β value of 200 for the transistor. Also, calculate the base, emitter and collector potentials for the circuit. Draw the DC loadline for the circuit and indicate the DC operating point on the loadline. If the β value for the transistor fluctuates by 20%, determine the variation of the DC operating point as a result of the fluctuation of β value. All the resistor values are in ohms. (15 marks) 7.The circuit below shows a fixed bias circuit where a resistor is inserted between the Emitter terminal and ground. Calculate the DC operating point for the circuit if the β value for the transistor is 100. Investigate the variation of the DC operating point if β varies by 10%. All the resistor values are in ohms. Is the transistor operating in the linear region? Justify your answer.