There are several electronic experiments for science fair available which is fully based on conceptual basis.
Some of the concepts that can be used for experiments are Electromagnetic Radiation Detectors, Opto electronics, Sensors & Measurement, Autonomous Robot Control and Automation, Solar Cells, Light Sensors and Measurement, Radar & Sonar, Lasers / UV / IR, Radio & Wireless, Telecommunications, Artificial Intelligence (AI) , Electronic Components and devices, Machine Vision, Electronic Instruments, Robots and devices etc.
Some of the electronic experiments for science fair include building an LED or building an LED using radiometer, some projects to prove the capacitors, vacuum tube triodes or creating your own diodes as well as semiconductors.
Some LED Experiments:
Create your own water conductivity meter of LED, which will help to measure the water quality .Try to find out the output of the alterations of LED flashlight over time constant, as the temperature varies. Compare the efficiency of LED with the common illuminated light bulb. Mix the color with LED. You can evaluate the output of an LED as an operation of current through it. Discover the operation of LED and evaluate whether LED has got the benefit to replace the normal light bulbs for saving the energy.
Some of The Capacitor Experiments:
It includes exploring the energy that you get from the sun through a super capacitor. Create your own super capacitor (Leyden jar) with the things that you found in and around your house and evaluate the charge that can be stored and test the different rounds of charges.
Try storing the static electricity in Leyden jar capacitor, which is made out of usual things found around the house and even if it happens try whether the charge inside the jar could be measured. Try variety of shapes like triangle, square and equilateral triangle of non symmetrical capacitors having an impact on thrust.
Create an electrolytic capacitor as well as oscillator with baking soda as the variable and test the properties of capacitance and explore the connection between voltage and thrust of a non symmetrical capacitor as a way of rendering air thrust, which is electro hydrodynamics or Biefield Brown Effect.
Some Experiments Regarding Semiconductors:
Create your own photocell, the time taken for a semiconductor device to attain the highest temperature whenever it is soldered in a circuit.
You can generate your own transistor, thermistor or other pressure sensors. Create semiconductor device with the help of iron pyrites and discover the Moore’s Law. Using QCMB or Quartz Crystal Microbalance, try to find out the antigen- antibody reactions.
Find out memory resistors and define the revolutionary cause. Light energy accurately evaluating surface area. With the help of an electronic photo sensor try to evaluate that inverse square law is applicable to light .Compare the resistivity of solder joints ad adhesives which are conductive.
Some Experiments Related To Diodes:
The temperature effects on the output of semiconductor diodes and how the spectrum of an ionized gas strike the quantity of electric current that a silicon diode delivers.
Try to build the baking soda rectifier. With the help of diode made at home try to get a negative resistance oscillator. Create your vacuum tube diode and build Zener-controlled power supply.