Schottky Rectifier Power Supply Board with 6 Capacitors for DIY Speaker Amplifier

Schottky Rectifier Power Supply Board — 6 Capacitors, DIY Speaker Amplifier

A high-performance AC-to-DC rectifier power supply board using Schottky barrier diodes and six large filter capacitors for low-noise, low-ripple dual-rail power supply construction. Designed specifically for DIY audio amplifier projects (Class AB, Class A, and valve/tube amplifier power stages) where low rectifier forward voltage drop and high capacitance filtering are essential for clean, hum-free audio output. Supports both single-rail and dual-rail (±) power supply configurations.

Technical Specifications

Parameter	Value
Rectifier Type	Schottky barrier diode bridge (low Vf, fast recovery)
Filter Capacitors	6 × electrolytic capacitors (high capacitance, low ESR)
Configuration	Full-wave bridge rectifier (single or dual rail)
Input	AC from transformer secondary (centre-tapped for dual rail)
Output	DC+ / GND / DC− (dual rail) or DC+ / GND (single rail)
Ripple Rejection	High (6-capacitor bank reduces ripple voltage)
PCB Material	FR4, 1.6mm, heavy copper traces
Certification	RoHS

Schottky vs Standard Rectifier Diodes

Parameter	Schottky	Standard (1N4007)
Forward Voltage (Vf)	0.2–0.4V	0.6–0.8V
Recovery Time	Nanoseconds (fast)	Microseconds (slow)
Power Loss	Lower (less heat)	Higher
Noise	Lower switching noise	Higher reverse recovery noise
Audio Suitability	Preferred for audio PSU	Acceptable for non-audio

Typical Applications

• Class AB Amplifier Power Supply: Dual-rail (±15V to ±45V) power supply for TDA7294, LM3886, TDA2050, and discrete transistor Class AB audio amplifier boards
• Class A Amplifier: High-capacitance single-rail supply for Class A amplifiers requiring large energy reserves for low-distortion operation
• Preamplifier & Tone Control: Low-noise regulated supply input stage for op-amp preamplifiers and active tone control circuits
• Subwoofer Amplifier: High-current dual-rail supply for subwoofer plate amplifiers and bass amplifier modules
• DIY Hi-Fi Power Supply: Upgrade power supply for commercial amplifier boards (TPA3116, TPA3255) replacing switching PSU with linear rectifier supply for lower noise floor

Wiring Guide

• Connect transformer secondary AC terminals to AC input pads on the board
• For dual-rail: use a centre-tapped transformer (e.g., 2×18V AC for ±25V DC output)
• For single-rail: use a standard secondary winding (e.g., 24V AC for ~33V DC output)
• DC output: connect DC+ and DC− to amplifier board power rails; GND to amplifier ground
• Add a slow-blow fuse on the AC input for protection

FAQ

Q: What transformer do I need for a ±35V dual-rail supply?
A: For ±35V DC output, use a centre-tapped transformer with 2×25V AC secondary (25V AC × √2 − Vf ≈ 35V DC). Transformer VA rating should be at least 1.5× the amplifier output power.

Q: Can I use this board with a toroidal transformer?
A: Yes. Toroidal transformers are preferred for audio power supplies due to lower magnetic field radiation and lower no-load losses. Connect the secondary windings to the AC input pads on the board.

Package Contents

• 1 × Schottky rectifier power supply board with 6 filter capacitors

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