Step Up and Step Down Chopper

The Step Up and Step Down Chopper is designed for practical study of power transistor switching and pulse width modulation techniques. It provides a suitable platform for understanding PWM pulse generation, frequency control, power transistor operation, and controlled power circuits through hands-on experimentation. The trainer includes a PWM pulse generator circuit, potentiometer-based frequency control, a 60 W bulb load, overload and short-circuit protection, and a CRO potential divider for waveform analysis. Designed and manufactured by Atico Export to meet the practical demands of modern laboratories.

Power Supplies:

• +15 V / 150 mA.
• Isolated supply: 0–12 V at 2 A.
• Mains operated: 230 V, 50 Hz ±10%.

Components Mounted on Panel:

• Power transistor BU508.
• PWM pulse generator circuit.
• Frequency control through potentiometer.

• 10:1 potential divider for CRO.
• Protective cover.
• 60 W bulb provided as load.
• Fuse protection against short-circuit conditions.
• Overload protection through circuit breaker.
• Front panel with high-class insulated printed circuit board featuring clearly printed circuits and symbols.
• Instruction manual.
• 4 mm patch cords.
• High-voltage test points with 4 mm safety sockets.
• Housed in a metal cabinet.
• Trainer size: 15 × 11 inches.