AL-E066 UJT FIRING OF SCR TECHNIQUE

Description

AL-E066 UJT FIRING OF SCR TECHNIQUE TRAINER

Detailed Technical Specifications

UJT Firing of SCR Technique Trainer

Product Category: Power Electronics Laboratory Equipment

1. Product Description

The AL-E066 UJT Firing of SCR Technique Trainer is designed for practical study of Unijunction Transistor (UJT) firing circuits and Silicon Controlled Rectifier (SCR) triggering techniques. It enables students to investigate controlled rectification, half-wave controlled converters, fully controlled single-phase converters and single-phase AC voltage regulation.

The trainer incorporates isolated AC power supplies, a UJT firing circuit, SCR assemblies, a pulse transformer, a potentiometer for firing-angle control and a resistive lamp load. Components are mounted on a printed front panel with circuit diagrams and 2 mm connection sockets.

2. Detailed Technical Specifications

3. Scope of Learning and Experiments

The trainer supports the following experiments, as specified in the source document:

1. Study of the UJT firing circuit.
2. Testing of a single-phase fully controlled converter using UJT firing.
3. Testing of a single-phase half-wave controlled converter.
4. Testing of a single-phase AC regulator.

4. Functional Modules

4.1 UJT Firing Circuit

·        UJT type: 2N2646.

·        Resistor and capacitor network for firing-pulse generation.

·        Potentiometer control for adjusting the firing angle.

·        Pulse transformer with 1:1:1 turns ratio for pulse coupling.

4.2 SCR Converter Module

·        TYN604 SCR assembly.

·        Connection facilities for SCR triggering and converter experiments.

·        Supports investigation of controlled rectification and firing-angle variation.

4.3 Power Supply Module

·        Isolated 0–12 V AC, 500 mA output.

·        Isolated 0–12 V AC, 250 mA output.

·        Mains input: 230 V AC, 50 Hz, as specified.

4.4 Resistive Load Module

·        Built-in 12 V lamp load.

·        Provides a visual indication of load operation during experiments.

4.5 Connection and Measurement Facilities

·        Printed circuit diagrams and component symbols.

·        2 mm connection sockets and patch cords.

·        Optional cathode-ray oscilloscope for observing waveforms, when supplied separately.

5. Construction and Safety Features

·          Compact ABS plastic enclosure.

·          Insulated front panel with printed circuit layouts.

·          Fuse-based short-circuit protection.

·          Clearly identified components and connection points.

·          Isolated low-voltage AC supplies for the specified experimental circuits.

·          2 mm patch cords for circuit interconnections.

Safety note: The source refers to high-voltage test points. The actual socket ratings and protection arrangements should be confirmed before use. Mains-powered experiments should be conducted by trained personnel under appropriate laboratory supervision.

6. Applications

·          Electrical and electronics engineering laboratories.

·          Power electronics practical training.

·          Polytechnic and engineering college laboratories.

·          SCR triggering and controlled rectifier demonstrations.

·          Study of AC voltage controllers and phase-angle control

OPTIONAL ACCESSORIES:

·                  CRO

Technical Details