35A Power Supply Board for Hi-fi Audio Amplifiers

35 A Unregulated Power Supply Board for Audio Amplifiers (Assembled)

This assembled board is designed to provide high-current unregulated DC power for audio amplifier applications.

Working Voltage:

• DC output voltage depends on transformer used
• Recommended transformer: up to 35-0-35 VAC (step-down, center-tapped)

Current Capacity:

• Designed for high current applications up to approximately 35 A (depends on transformer, load, and heat dissipation)

Rectifier and Filtering:

• Heavy-duty bridge rectifier: GBJ5010 (or equivalent)
• Filter capacitors: 10000 µF / 63 V × 4 (30 mm diameter)
• Designed to deliver high peak current with low ripple for audio applications

Protection Features:

• Fuses provided on each supply rail for fault protection and short-circuit prevention

Board Specifications:

• PCB material: Glass Epoxy FR4
• PCB dimensions: 128 mm × 68 mm (5 inch × 2.6 inch)
• PCB thickness: 1.6 mm

Construction:

• Fully assembled board
• Uses through-hole components
• Components are commonly available for servicing

Configuration:

• Designed for center-tapped transformer input for dual DC rail generation
• Requires proper heat sinking for rectifier and adequate wiring for high current paths
• Output performance depends on transformer and load conditions

Intended Use:

• Power supply for high-power audio amplifiers
• Subwoofer and high-current amplifier systems
• DIY audio and power supply projects