The ETB-179 Photo Transistor Trainer is a compact and self-contained experimental platform designed to study the working characteristics of photo transistors. Equipped with a built-in regulated power supply and clear circuitry layout on a printed board (C.R. - Circuit Representation), it allows students to explore the light-sensitive behavior of phototransistors under different lighting conditions.

This trainer is ideal for use in electronics labs for demonstrating optoelectronic sensor applications, light detection principles, and switching behavior. All test points are accessible and labeled to facilitate accurate measurements and analysis.

⚙️ Key Features:

• Study the working of NPN or PNP photo transistors

• Built-in regulated DC power supply

• Clear circuit representation on board

• Onboard light source for triggering the photo transistor

• Easy-to-follow layout with test points

• Durable and portable educational model

🎓 Educational Objectives:

• Understanding the principle of phototransistor operation

• Observing photo current variations with changes in light intensity

• Analyzing the switching behavior of a photo transistor

• Applications in light-activated circuits and optoelectronics

🧪 Scope of Learning:

• Light-to-current conversion

• Photoconductive vs. photovoltaic effect

• Practical applications like IR sensors, smoke detectors, and optical switches