Electronics Engineering Lab

List of Experiments / Activities

1. List of Experiments (Any Ten Experiments)
2. 1Diode Characteristics and Rectifier Plot forward V-I characteristic of a silicon diode; set up a full-wave bridge rectifier; observe output with and without filter capacitor. Application: DC supply for industrial sensor transmitter or PLC input module.
3. 2Zener Diode Voltage Regulator Set up a Zener voltage regulator; vary supply and load; measure regulation. Application: regulated 5V / 12V supply for field instrument transmitter circuits in process plant.
4. 3BJT as a Switch – Relay Driver for Actuator Control Use NPN BJT to drive a relay coil; connect relay to switch a lamp or motor ON/OFF using a small control signal. Application: PLC transistor output driving a solenoid valve in chemical plant or a conveyor belt relay in textile mill.
5. 4Optocoupler – Isolation between Control and Power Circuit Demonstrate an optocoupler (PC817) isolating a low-voltage control signal from a higher-voltage load circuit; observe LED- phototransistor action. Application: PLC output isolation, VFD signal isolation in industrial drives.
6. 5Thermistor / LDR Sensor Characteristics and Bridge Circuit Measure resistance-temperature (thermistor) or resistance-light (LDR) characteristics; set up a Wheatstone bridge; observe bridge output voltage change with sensor input. Application: temperature sensing in chemical reactor or light sensing in greenhouse.
7. 6Op-Amp Signal Amplifier for Sensor Output Connect thermistor bridge output to a non-inverting op-amp amplifier (IC 741); measure amplified output voltage for different temperatures. Application: amplifying 4–20 mA sensor signal for PLC analog input in process control.
8. 7Op-Amp Comparator – Threshold Alarm Set up an op-amp comparator with a sensor (thermistor or LDR) on one input and an adjustable reference on the other; observe alarm LED triggering when threshold is crossed. Application: over-temperature alarm in chemical reactor, level alarm in storage tank.
9. 8Logic Gate Truth Table Verification Verify truth tables of AND, OR, NOT, NAND gates using a logic trainer; implement a simple industrial logic: Motor ON = Switch_A AND (NOT Emergency_Stop). Application: basic PLC ladder logic equivalent in discrete gate form.
10. 97-Segment Display Driver – Digital Readout Drive a 7-segment display using a BCD decoder IC (7447) and DIP switches to display digits 0–9; understand how a digital readout shows sensor data. Application: digital temperature/pressure display on process plant HMI.
11. 10Complete Sensor-to-Display Chain Connect a thermistor sensor → Wheatstone bridge → op-amp amplifier → op-amp comparator (alarm) → digital display (or LED bar graph); demonstrate the full signal chain. Application: temperature monitoring and alarm system in a manufacturing plant or textile drying oven.
12. 11IIoT Demo – Sensor Data on Cloud Dashboard (Arduino/NodeMCU) Connect a temperature or soil moisture sensor to a NodeMCU; display readings on serial monitor; (if Wi-Fi available) push data to a free IoT platform (ThingSpeak / Blynk). Application: remote condition monitoring of machines in Industry 4.0 factory.
13. Equipment / Instruments Required
14. •DC regulated power supply and digital multimeters
15. •Breadboard and component kit (diodes, Zener, NPN BJT, IC 741, optocoupler PC817)
16. •Thermistor, LDR, and Wheatstone bridge setup
17. •Relay (5V), indicator LED, small lamp for relay switching
18. •Digital logic trainer (ICs 7408, 7432, 7404, 7400)
19. •7-segment display with BCD decoder IC 7447 and DIP switches
20. •Arduino / NodeMCU + temperature or moisture sensor + USB cable
21. •Laptop with Falstad Circuit Simulator / Tinkercad (browser-based, free)