EVENT TITLE : TECH HANDS-ON ELECTRONICS FUNDAMENTALS

DATE : 25.08.2025

TIME : 9.00 a.m to 3.00 p.m

VENUE : Dr. B.M.S Mat Hr Sec school

EVENT CONVENER : Dr. N.V.S. Sree Rathna Lakshmi

EVENT COORDINATORS : Dr. Ramya.G, Dr Jacintha.V, Dr.Karthiga,Dr.M.Saravanan, Dr. Sharmila.P

NO. OF PARTICIPANTS : 62 students

SUMMARY OF THE EVENT:

A Tech Workshop on Basic Electronics Fundamentals was organized to provide students with both theoretical knowledge and practical exposure to electronic components and circuits. The event aimed at strengthening the basics of electronics through interactive learning and hands-on experience. The session began with a warm welcome to the Resource Persons, Dr. Jacintha V. and Dr. R. Karthiga , by the Principal, Mrs. Jayanthi Christopher.

The Resource Persons delivered an insightful lecture covering the fundamental concepts of electronics and the functioning of basic components. Students were then provided with hands-on learning experiences using electronic kits. Demonstrations included:

DC Lighting Circuit
Rain Alarm
Simple Temperature Monitor
Touch Sensor Circuit
LED Circuit

A total of 62 students participated in the workshop, actively engaging in the activities. They also learned the resistor color coding system and practiced finding the values of resistors on their own. To conclude the session, a Quiz was conducted to reinforce the concepts taught, followed by a feedback session to gather students’ responses. Overall, the workshop was a valuable and enriching learning experience, enhancing both theoretical knowledge and practical skills in electronics.

PROJECT KITS DEMONSTRATED IN THE WORKSHOP

DC Lighting Circuit, Rain Alarm, Simple Temperature Monitor, Touch Sensor Circuit, LED Circuit etc.

DC LIGHTING CIRCUIT

A DC supply is used for a small LED that has two terminals namely anode and cathode. The anode is +ve and a cathode is –ve. Here, a lamp is used as a load that has two terminals such as positive and negative. The +ve terminals of the lamp are connected to the anode terminal of the battery and the –ve terminal of the battery is connected to the –ve terminal of the battery. A switch is connected in between wire to give a supply DC voltage to the LED bulb.

Fig 1 : DC Lighting Simple Electronic Circuit

Rain Alarm

The following rain circuit is used to give an alert when it’s going to rain. This circuit is used in homes to guard their washed clothes and other things that are vulnerable to rain when they stay in the home most of the time for their work. The required components to build this circuit are probes, 10K and 330K resistors, BC548 and BC 558 transistors, 3V battery, 0.1mf capacitor, and speaker.

Fig 2: Rain Alarm Circuit

Simple Temperature Monitor

This circuit gives an indication using an LED when the battery voltage falls below 9 volts. This circuit is ideal to monitor the level of charge in 12V small batteries. These batteries are used in burglar alarm systems and portable devices. The working of this circuit depends on the biasing of the base terminal of the T1 transistor. When the voltage of the battery is more than 9 volts, then the voltage on base-emitter terminals will be the same. This keeps both transistors and LED off. When the voltage of the battery reduces below 9V due to utilization, the base voltage of the T1 transistor falls while its emitter voltage remains the same since the C1 capacitor is fully charged. At this stage, the base terminal of the T1 transistor becomes +ve and turns ON. C1 capacitor discharges through the LED.

Fig 3: Temperature Monitor Simple Electronic Circuit

Touch Sensor Circuit

The touch sensor circuit is built with three components such as a resistor, a transistor, and a light-emitting diode. Here, both the resistor and LED connected in series with the positive supply to the collector terminal of the transistor.Select a resistor to set the current of the LED to around 20mA. Now give the connections at the two exposed ends, one connection goes to the +ve supply and another goes to the base terminal of the transistor. Now touch these two wires with your finger. Touch these wires with a finger, then the LED lights up!

Fig 4: Touch Sensor Simple Electronic Circuit

LED Flasher Circuit

The circuit configuration of an LED flasher is shown below. The following circuit is built with one of the most popular components like the 555 timer and integrated circuits. This circuit will blink the led ON & OFF at regular intervals.From left to right in the circuit, the capacitor and the two transistors set the time and it takes to switch the LED ON or OFF. By changing the time it takes to charge the capacitor to activate the timer.

Fig 5: LED Flasher Simple Electronic Circuit

The IC 555 timer is used to determine the time of the LED stays ON & OFF.It includes a difficult circuit inside, but since it is enclosed in the integrated circuit. The two capacitors are located on the right side of the timer and these are required for the timer to work properly. The last part is the LED and the resistor. The resistor is used to restrict the current on the LED. So, it won’t damage