PW28 Dual Power Rectifier Filter Module Circuit Working Explanation

High-current compact rectifier filter circuit board with dual DC outputs ranging from 10V to 17V, capable of delivering up to 22A of current. It's designed to provide clean power for audio amplifiers such as LM1875, TDA2030, TDA7294, and LM3886. The module accepts an AC input (RMS) range of 8V to 15V from a center-tapped transformer, and includes a built-in power-ON LED indicator. Additionally, it offers a single +34V DC output for higher voltage applications.

PW28 dual power rectifier filter module circuit board

Specification of PW28 Dual Power Rectifier Filter Module

The quick technical specification of the circuit board is given below.

Module Type	Power Supply
Chip Used	GBJ2510
Input Type	AC
Input Voltage Range	8V to 15V
Input Terminal	AC, GND, AC
Output Type	DC
Output Voltage	Dual DC ±10V to ±15V, Single DC +34V
Output Terminal	+V, GND, -V, and +DC-
Output Current	22 Ampere Max.
PCB Colour	Green

PW28 Dual Power Rectifier Filter Module Circuit Diagram

Schematic of pw28 dual power rectifier filter module circuit is shown below.

The components are used in the circuit boards are - D1: GBJ2510 Bridge Rectifier, C1 C2 C3 C4: 3300uF 35V Electrolytic Capacitor, R1: 1K 1/4W Resistor, D2: 3MM Red LED, C2 C3: 100nF Ceramic Capacitor, H1 H2: 3 Screw Terminal Connector, and H3: 2 Pin Connector.

Working Principle of PW28 Dual Power Rectifier Filter Module Circuit

This is a full-wave bridge rectifier circuit with a 4x capacitor bank, and the working is simple. When an external center-tapped step-down transformer secondary is connected to the H1 connector of the circuit board and the transformer primary is powered ON, the bridge rectifier fully rectifies the AC voltage to DC voltage.

The 4x parallel capacitor bank (C1, C2, C3, C4) filters the DC and provides a single output (up to +34V) DC to the connector (H3), with power-ON indication through LED (D2). The dual output is achieved through the connector (H2), where GND is the common of the external step-down transformer secondary. The capacitors (C1, C2) are connected in parallel with each output and GND to filter the noise. These dual outputs (+V, -V) are half-wave rectified and range from ±10V to ±17V across GND, with a maximum current of 22A.