Experiment with germanium crystals

Experiment with NTC thermistor

LED in a single circuit

LED as a source of power

A LED is connected to the power supply unit with a long wire

Preparing an opto-electronic display using LEDs

Preparation of a light gate

Colour blending in table-tennis balls with LEDs

Measuring the characteristics of the LED voltage-current

How to protect an exhibit using LEDs?

Illustration of the operation of the rectifying Graetz-circuitry

Checking the conductivity of the transistor outputs

Experiment with a solar cell

Electric field can be scanned by LEDs