1. Esd Lab Coats

Electronics System Design Lab VII Sem ECE EC 2404 ELECTRONICS SYSTEM DESIGN LAB 1. Design of a 4-20mA transmitter for a bridge type transducer. Design the Instrumentation amplifier with the bridge type transducer (Thermistor or any resistance variation transducers) and convert the amplified voltage from the instrumentation amplifier to 4 – 20 mA current using op-amp. Plot the variation of the temperature Vs output current. Design of AC/DC voltage regulator using SCR Design a phase controlled voltage regulator using full wave rectifier and SCR, vary the conduction angle and plot the output voltage. Design of process control timer Design a sequential timer to switch on & off at least 3 relays in a particular sequence using timer IC. Design of AM / FM modulator / demodulator i.

Design AM signal using multiplier IC for the given carrier frequency and modulation index and demodulate the AM signal using envelope detector. Design FM signal using VCO IC NE566 for the given carrier frequency and demodulate the same using PLL NE 565. Design of Wireless data modem. Design a FSK modulator using 555/XR 2206 and convert it to sine wave using filter and transmit the same using IR LED and demodulate the same PLL NE 565/XR 2212. PCB layout design using CAD Drawing the schematic of simple electronic circuit and design of PCB layout using CAD 7. Microcontroller based systems design Design of microcontroller based system for simple applications like security systems combination lock.

DSP based system design Design a DSP based system for echo cancellation, using TMS/ADSP DSP kit. Psuedo-random Sequence Generator 10. Arithmetic Logic Unit Design Note: Kits should not be used.

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Instead each experiment may be given as mini project. TOTAL= 45 PERIODS Jerusalem College of Engineering Page 1 Electronics System Design Lab VII Sem ECE INDEX Jerusalem College of Engineering Page 2 S.No. Experiment Name 1 Design of a 4-20mA transmitter for a bridge type transducer 2 AC/DC voltage regulator using SCR 3 Design of process control timer 4 a) Design of AM modulator / demodulator b) Design of FM modulator 5 Design a FSK modulator using XR 2206 6 PCB layout design using CAD 7 Psuedo-random Sequence Generator 8 Arithmetic Logic Unit Design 9 Microcontroller based systems design 10 DSP based system design Electronics System Design Lab VII Sem ECE 1. DESIGN OF A 4-20mA TRANSMITTER FOR A BRIDGE TYPE TRANSDUCER.

AIM: To design the instrumentation amplifier with the bridge type transducer and convert the amplified voltage from the instrumentation amplifier to 4-20mA current using op-amp. SOFTWARE REQUIRED: Orcad THEORY: In a number of industrial and consumer applications physical quantities such as temperature, pressure and light intensity are to be measured and controlled. These physical quantities measured with the help of transducers have to be amplified so that it can drive the display system. This function is performed by an instrumentation amplifier. The circuit uses a resistive transducer whose resistance changes as a function of the physical quantity to be measured.

The bridge is initially balanced by a dc supply so that V1=V2. As the physical quantity changes, the resistance RT of the transducer also changes, causing an unbalance in the bridge (V1≠V2). This differential voltage gets amplified by the three op-amp differential instrumentation amplifier. The amplified voltage is converted to current using V-I converter. The important features of instrumentation amplifier are: 1. High Gain Accuracy 2.

High Gain Stability With Low Temperature Coefficient 4. Low Dc Output 5. High Output Impedance Jerusalem College of Engineering Page 3 Electronics System Design Lab VII Sem ECE DESIGN: A sensistor is a type of resistor whose resistance changes with temperature. Instrumentation Amplifier: Let V1 = 2.3v V2 = 2.5v V0 = 4v Assume R' = 45k R = 10k V0 = R2/R1(1+90k/10k)(0.2v) 4v = R2/R1(1+90k/10k)(0.2v) 4 = 2R2/R1 R2/R1 = 2. Let R1 = 50k R2 = 100k V - I Converter: Let V0 = 4v I0 = 8mA R = V0/ I0 R = 500Ω Jerusalem College of Engineering Page 4 Electronics System Design Lab VII Sem ECE CIRCUIT DIAGRAM: U 5 u A 7 4 1 3 2 7 4 6 1 5+ - V+ V- O U T O S 1 O S 20 V 5 1 5 V d c V 9 1 5 V d c U 2 u A 7 4 1 3 2 7 4 6 1 5+ - V+ V- O U T O S 1 O S 2 U 3 u A 7 4 1 3 2 7 4 6 1 5+ - V+ V- O U T O S 1 O S 2 0 VR 1 4 1 5 k 2 1 R 1 1 5 0 0 21 V 1 2 1 5 V d c I R 8 1 0 0 k 21 0 R 1 5 1 5 k 2 1 R 2 0 5 0 0 21R 4 1 0 k 2 1 R 1 2 1 5 k 21 V 1 1 1 1 5 V d c R 1 0 1 0 0 k 21 0 R 6 5 0 k 21 V 0 0 R 5 4 5 k 2 1 0 R 1 3 1 5.

5 k 21 V 1 1 5 5 V d c 0R 7 5 0 k 21V V 8 1 5 V d c V 7 1 5 V d c U 1 0 L M 7 4 1 3 2 7 4 6 1 5+ - V+ V- O U T O S 1 O S 2 0 V 3 0 1 5 V d c 0 R 3 4 5 k 2 1 V 4 1 5 V d c 0 0 PINDIAGRAM of IC741: PROCEDURE: 1. Connections are given as per the circuit diagram. Use PSPICE simulator and run. Jerusalem College of Engineering Page 5 Electronics System Design Lab VII Sem ECE 3.

Note down the input voltages applied to the IA, output voltage of IA and output current. Vary the resistance value and note down the readings. Plot the variation of resistance Vs output current. TABULATION: Sl.No Resistance (kΩ) Input Voltage (V1) volts Input Voltage (V2) volts Output Voltage (V0 )volts Output Current (I0 )mA RESULT: Thus the instrumentation amplifier with the bridge type transducer was designed and the amplified voltage was converted to current.

VIVA QUESTIONS: 1. What is Instrumentation Amplifier?

Explain the working of the circuit. When will wheat stone bridge be balanced? Give the important features of IA. What is a transducer? Jerusalem College of Engineering Page 6 Electronics System Design Lab VII Sem ECE 2. AC/DC VOLTAGE REGULATOR USING SCR AIM: To construct a phase controlled voltage regulator using full wave rectifier and SCR. SOFTWARE: OrCad THEORY: In phase control the Thyristors are used as switches to connect the load circuit to the input ac supply, for a part of every input cycle.

That is the ac supply voltage is chopped using Thyristors during a part of each input cycle. The thyristor switch is turned on for a part of every half cycle, so that input supply voltage appears across the load and then turned off during the remaining part of input half cycle to disconnect the ac supply from the load.

Esd Lab Coats

By controlling the phase angle or the trigger angle ‘α ’ (delay angle), the output RMS voltage across the load can be controlled. The trigger delay angle ‘α ’ is defined as the phase angle (the value of ω t) at which the thyristor turns on and the load current begins to flow. CIRCUIT DIAGRAM: Jerusalem College of Engineering Page 7 Electronics System Design Lab VII Sem ECE R 1 0 1 k 2 1 I X 3 2 N 1 5 9 5 0 R 7 1 k 21 V 1 2 5 V d c V 1 0 F R E Q = 1 k V A M P L = 5 V O F F = 0 R 9 1 k 2 1 D 5 D 1 N 4 0 0 7 X 2 2 N 1 5 9 5 V 0 V 8 F R E Q = 1 k V A M P L = 5 V O F F = 0 0 V GRAPH: PROCEDURE: 1. Connections are given as per the circuit diagram. Use PSPICE simulator and run. Note down the input voltages applied to the SCR, output voltage and current of SCR. Jerusalem College of Engineering Page 8 Electronics System Design Lab VII Sem ECE 4.

Plot the Graph. RESULT: Thus the phase controlled voltage regulator using full wave rectifier and SCR was constructed and output was verified. VIVA QUESTIONS: 1. What is meant by phase controlled voltage regulator?

Explain the operation of the circuit. List the applications of SCR. What is firing angle? Give the methods to trigger the SCR? DESIGN OF PROCESS CONTROL TIMER AIM: Design a sequential timer to switch on & off 3 relays in a particular sequence using timer IC.

SOFTWARE REQUIRED: OrCad THEORY: The process control is the activities involved in ensuring a process is predictable, stable and consistently operating at a level(target) of performance with only normal variation. The IC 555 is highly stable device for generating accurate time delay oscillations. The process control timer designed using timer IC555 is operated in either astable or monostable mode. There are three timers used to trigger the other timers through a switch control. The output of the next timer is obtained after a delay with respect to the delay in the triggering of the circuit. DESIGN: vc= Vcc (1 – e-t/RC) Jerusalem College of Engineering Page 9 Electronics System Design Lab VII Sem ECE At t = T, vc= (2/3) Vcc Therefore, T=1.1RC Here, T=1.1 ms Assume C= 0.1uF R = R= 10KΩ CIRCUIT DIAGRAM: 0 0 0 V U 9 5 5 5 a l t 1 2 3 4 5 6 7 8 G N D T R I G G E R O U T P U T R E S E T C O N T R O L T H R E S H O L D D I S C H A R G E V C C 1 0 k 2 1 R 5 1 k 2 1 1 2.

1 u 1 2 1 k 2 1 5 V d c 0 C 4. 1 u 1 20 0 0 1 2 0 1 2 U 3 5 5 5 a l t 1 2 3 4 5 6 7 8 G N D T R I G G E R O U T P U T R E S E T C O N T R O L T H R E S H O L D D I S C H A R G E V C C.

1 u1 2 V V 1 0 k 2 1. 1 u 1 2 V 0 0 0 0 U 7 5 5 5 a l t 1 2 3 4 5 6 7 8 G N D T R I G G E R O U T P U T R E S E T C O N T R O L T H R E S H O L D D I S C H A R G E V C C. 1 u 1 2 1 0 k 2 1 5 V d c 0 0 1 k 2 1 V 6 T D = 0 T F = 0 P W = 1 m P E R = 2 m V 1 = 5 T R = 0 V 2 = 0 5 V d c Jerusalem College of Engineering Page 10 Electronics System Design Lab VII Sem ECE TABULATION: Timer 1 Time, t = ms Frequency= Hz Timer 2 Time, t = ms Frequency= Hz Timer 3 Time, t = ms Frequency= Hz GRAPH: PROCEDURE: 1. Connections are given as per the circuit diagram. Use PSPICE simulator and run.

Note down the input voltages applied and the output at each stage. Plot the Graph.

Jerusalem College of Engineering Page 11 Electronics System Design Lab VII Sem ECE RESULT: Thus a sequential timer was designed to switch on & off 3 relays in a particular sequence using timer IC. VIVA QUESTIONS: 1. List the application of the Timer. Explain the circuit operation 3. What is a relay and give its uses? What do you mean by a process control timer? Why is monostable multivibrator used in the circuit?

4a) AM MODULATOR / DEMODULATOR AIM: To construct Amplitude Modulator circuit using multiplier IC and Demodulator circuit using envelop detector. SOFTWARE REQUIRED: OrCad THEORY: Jerusalem College of Engineering Page 12 Electronics System Design Lab VII Sem ECE Modulation is achieved by varying one of the three parameters, amplitude, frequency and phase in accordance with the message signal while keeping the other two parameters as constant. Hence the amplitude is varied in accordance with the instantaneous values of the low frequency signals. The frequency of the carrier is much greater than the amplitude of the modulating signal to avoid over modulation. CIRCUIT DIAGRAM: 0 V 2 F R E Q = 1 0 k V A M P L = 5 V O F F = 0 U 1 A D 6 3 3 / A D 1 2 3 4 6 7 8 5 X 1 X 2 Y 1 Y 2 Z W V + V - C 4. 0 0 9 u1 2 C 3. 1 u 1 2 0 V 4 1 5 V d c V 3 1 5 V d c 0 V 1 F R E Q = 1 k V A M P L = 5 V O F F = 0 0 R 2 5 0 k 21 D 2 D 1 N 4 0 0 1 0 0 0 C 1.

1 u 1 2 0 0 Modulation Index = GRAPH: Jerusalem College of Engineering Page 13 Electronics System Design Lab VII Sem ECE PROCEDURE: 1. Connections are given as per the circuit diagram. Use PSPICE simulator and run. Note down the input voltages applied and output voltage 4. Also note down the demodulated output. Plot the Graph and calculate the modulation index. RESULT: Thus the message signal was modulated and demodulated.

The modulation index was also calculated. VIVA QUESTIONS: 1. What is modulation and the need for it? Give its types. What is an envelope detector? Explain the working of the circuit. What is demodulation?

What is modulation index? Jerusalem College of Engineering Page 14 Electronics System Design Lab VII Sem ECE 4.b FREQUENCY MODULATION AIM: To perform the Frequency modulation using IC 566 and to calculate the modulation index for various modulating voltages. HARDWARE REQUIRED: Frequency generator, IC NE566, Resistors, Capacitor, CRO, Bread board and connecting wires, RPS. THEORY: Frequency modulation is a process of changing the frequency of a carrier wave in accordance with the slowly varying base band signal.

The main advantage of this modulation is that it can provide better discrimination against noise. Frequency Modulation using IC 566: A VCO is a circuit that provides an oscillating signal whose frequency can be adjusted over a control by Dc voltage. VCO can generate both square and triangular wave signal whose frequency is set by an external capacitor and resistor and then varied by an applied DC voltage.

IC 566 contains a current source to charge and discharge an external capacitor C1 at a rate set by an external resistor. R1 and a modulating DC output voltage. The Schmitt trigger circuit present in the IC is used to switch the current source between charge and discharge capacitor and triangular voltage developed across the capacitor and the square wave from the Schmitt trigger are provide as the output of the buffer amplifier. The R2 and R3 combination is a voltage divider, the voltage VC must be in the range 3/4 VCC.