Prelab- DC 4

Consider the Zener diode circuit shown in Figure. The Zener Breakdown Voltage (Vz) is 5.6 V at Iz= 0.1mA. Zener resistance is r,= 10 0. What is Vo without load (RL= ∞) ? R= 0.5 kQ Vo Vps= 10 V

1) How is the diode and zener diode in the electronic circuit and how they work?indicate the differences between them.2) Can a zener diode be used instead of a regular diode? please explain.3) Is it to step down and rectify the 220V AC signal by means of a transformer or to convert 220 V?rectify it and then reduce its value to the desired DC level using a voltage divider circuit?suitable.?4) Bridge type full wave rectification with two diodes full wave rectification using a medium ended transformerCompare the rectifier circuit and list its advantages and disadvantages relative to each other.5) What is the concept of PIV (Peak Inverse Voltage) for rectifier circuits?For which rectifier circuits is this value more important?

Please answer as soon as possible show all work

Given the zener voltage at 9V and the zener power at 1W, what is the range of allowable values of Iz (operating values). a) 0.11A b) 22mA to 89mA c) 9A d) 0.11A to 9A

Q2) Explain the working of zener diode on both forward and reverse bias. From the circuit in the Figure-2, Rs=1KO, Vz=7.2V and RL=3KN. If Vs = 12V. Find out the following DC parameters: a) Is = ?, Current passing through resistor Rs b) IL = ?, Current passing through resistor RL c) Iz = ?, Current passing through Zener Diode d) VL= ?, Output Voltage (Figure-2) Rs 1k Ohm Is Iz RL VL Vs UA723_ZD2 .3k Ohm 12 V

Part C. Zener Diode 1. 2. 4. Find a datasheet for a 1N749A Zener Diode. Record the value for reverse breakdown voltage below: 1N749A Reverse Breakdown voltage_ Build the circuit shown in Figure 3 in multisim. Include a voltmeter to measure the voltage across the Diode with the polarity reference shown and an ammeter to measure the current with direction as shown. (Note: for easy wiring, you can right-click on the meters in your circuit, and flip them horizontally.) Operate the supply voltage (Vsupply) between ± 20 V in steps of 1 V (i.e., -20 V, -19 V, -18 V, etc.) and place your results in Table 3 5. Plot the I-V characteristics of the diode using the data from Table 5 of the Lab Report. You should either do a **CLEAR** plot by hand or use a program like EXCEL and paste the results in the space provided V supply 1 ΚΩ www ww Current 1N749A * 510 2 ΚΩ Voltage + Figure 3: Third Circuit Using a Zener Diode 200 Ω

Discussion: 1. Discuss the obtained curves. 2. What are the advantages of using cascade voltage regulater circuit? 3. To stabilize a voltage of 65 V, one can: a. Use one 65V zener diode b. Use ten 6.5 V zener diodes in series If the costs are irrelevant, then which solution is best and why? I R. (A I O Vin v)Vout Figure (5.2) A stabilizer circuit with variable power supply. IL V (V) Vout RL Figure (5.3) A stabilizer çircuit with variable load.

A PMMC type meter has a full scale deflection of 10 mA. The resistance of the coil is 30 ohm. Then (1) shunt value for an Ameter of 50 A range and (2) Find the value of series resistance required for the range up to 500 V.

For the circuit in the figure, let V input = 8V, Ri = 12ohms, RL = 10ohms, and VZ = 3.3V. Determine the voltages and currents of the resistors and the current of the zener diode.

Q1)Design moving coil ammeter as a voltmeter to read 15 V (RMS) alternating voltage. If the internal resistance of the ammeter is 5 K2, the voltage across the internal resistance is 0.5 v and the resistance of the diodes in the forward direction is 1 K2, find the multiplier resistance and sensitivity. Assume half wave rectification and a shunt resistance across the meter. The value of the shunt resistance across the ammeter is 2.5 KQ. Q2) Re-design the question above for full wave rectifier (without Rsh)

1. The Figure (i) and Figure (ii) show the centre-tap and bridge type circuits having the same load resistance and transformer turn ratio. The primary of each is connected to 230V, 50 Hz supply. (i) Find the d.c. voltage in each case. (ii) PIV for each case for the same d.c. output. Assume the diodes to be ideal. 5:1 100 0 100 2 230 V 230 V ww ww (1) (ii)

How do I calculate the dynamic resistance of a zener diode with the following set of values given please? The circuit in figure is the circuit in question I am trying to solve this for please. Vin(DC) = 10V vin(ac) = 0.05sin(wt) Vz(voltage of diode) = 4.5V R1 = 1000 ohms

In the figure given we have u(t)=10. cosot [V]. We assume the diodes and the A-meter (A) to be ideal. A u(t) a) Plot the waveform of the current flowing through the A-m in scale. b) What is the reading of the A-m, if it is moving-coil type? c) What is the reading of the A-m, if it is moving-iron type? d) Calculate the power factor of the WHOLE structure. R1 1 R2 102

3-3 rectification? A d'Arsonval meter movement with a full-scale deflection current rating of 1 mA and an internal resistance of 500 2 is to be used in a half-wave rectifier ac voltmeter. Calculate the ac and dc sensitivity and the value of the multiplier resistor for a 30-V rms range.

Q1)Design moving coil ammeter as a voltmeter to read 15 V (RMS) alternating voltage. If the internal resistance of the ammeter is 5 KQ , the voltage across the internal resistance is 0.5 v and the resistance of the diodes in the forward direction is 1 KQ, find the multiplier resistance and sensitivity . Assume half wave rectification and a shunt resistance across the meter. The value of the shunt resistance across the ammeter is 2.5 KQ. Q2) Re-design the question above for full wave rectifier (without Rsh)

The Figure 2 shows an electronic circuit designed for supplying power to a load (R1). The supply voltage 235V (RMS, AC) at frequency of 50HZ. The required DC voltage and power for the load are 24V and 3.6 W respectively. The Electrical Components of this AC to DC converter are: A full-wave rectifier to convert AC voltage to DC voltage. A regulator with transistor and Zener diode to ensure a constant voltage and power for the load. D1 Iide 91 Vaut VLoad D2 D3 Vde VI sine R1 RL Regulate Reetifier Figure 2. Complete Circuit Assume that the diodes are real diodes (NOT ideal diodes). The following information is available: The collector to base resistor of the regulator R1 = 5.0 k The transistor Q1 with B value of 24 is used for the regulator circuit. Determine the following quantities for this electronic device and fill the table below: Question Answer The voltage of Zener Diode (Vz) The current in R1 The DC current into the regulator | (Idc) Base current of transistor (IB) Collector…

The four diodes used in a bridge rectifier circuit have forward resistances which may be considered constant at 1 ohm and infinite reverse resistance. The alternating supply voltage is 220 V r.m.s. and load resistance is 580 ohm. Calculate (i) mean load current and (ii) power dissipated in each diode.

A PMMC instrument has internal resistance of 0.77 ko and gives full scale deflection for 35 mA. The required resistance value of multiplier resistors for employing the meter as a multi range voltmeter for voltage range 79 V will be ohms. 102562.40 O 224.94 1487.14 O -326.96

Q3 For the network of figure shown below, 120 V determine and Sketch V, across the load resistance R, and determine Is . RL , Vi (assume ideal diodes) 2 k2 -100 V 3 k2

VR R a.1 For the Zener diode network shown in the figure to the right, determine VL, VR, Iz, and Pz. 1k2 V2 = 10 V 7 RL1.2 k2 VL 16 V a.2. Repeat part (a.1) with RL = 3 k2. PZM = 30 mW %3D

In the circuit of the following figure, the input voltage Vs is 15 volts rms with a frequency of 60 Hz, R equals 150 Ohms and C equals 100,000 Pico Farads. The diodes are Germanium (Vd = 0.2 volts) and the Zener diode is 12 volts. a) The magnitude of the ripple voltage at Cb) The Magnitude of the Peak Inverse Voltage (PIV) for D1 and D2.

A half-wave rectifier is needed to supply 15-V dc to a load that draws an average current of 250 mA. The peak-to-peak ripple is required to be 0.2 V or less. What is the minimum value allowed for the smoothing capacitance?

What is Basic Circuit element

In the figure given we have u(t)=10- cosot [V]. We assume the diodes and the A-meter (A) to be ideal. a) Plot the waveform of the current flowing through the A-m in scale. b) What is the reading of the A-m, if it is moving-coil type? A u(t) R1 R2 c) What is the reading of the A-m, if it is moving-iron type? d) Calculate the power factor of the WHOLE structure. 5Ω 10Ω