We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Green printed circuit board with flat bridge rectifier and dual output terminals

SMUGDESK

SMUGDESK PW28 Dual Power Filter Rectifier Board 25A

SKU CH-87SS-8H7PM

A 25 A dual-rail rectifier and filter board that converts transformer AC into unregulated DC for audio amplifier DIY builds

  • 25 A flat bridge delivers high current for demanding amplifier builds
  • dual symmetrical DC rails provide clean power for audio circuits
  • integrated rectifier and filter simplifies DIY power supply assembly
  • thickened copper traces reduce heat and voltage drop under heavy load
  • compact module fits easily into HiFi and repair projects

SMUGDESK PW28 Rectifier Board

The SMUGDESK PW28 is an unregulated dual-rail rectifier and filter module built around a 25A flat-bridge rectifier. It accepts AC input from a power transformer and delivers symmetrical positive and negative DC rails for audio power amplifier circuits. The board is intended for DIY builders, hobbyists and technicians repairing or assembling HiFi amplifiers who need a compact, ready-made power front-end.

Sustained high-current behaviour

Thickened copper traces on the PCB are designed to carry the rated 25A flat-bridge current continuously, reducing voltage drop and heat rise during extended high-power amplifier operation. The integrated rectifier and filter combination maintains stable unregulated output without the sag that can appear on lighter trace layouts when an amplifier draws heavy current for long periods.

Thermals noise and power draw

The flat-bridge component generates noticeable heat under heavy load, so adequate airflow or heatsinking must be provided to keep temperatures in check. The board itself produces no audible noise, leaving the acoustic signature entirely to the downstream amplifier and its cooling. Power draw is determined solely by the connected transformer and amplifier load, with the module adding only the rectifier’s forward-voltage loss.

Highlights

  • 25 A flat bridge delivers high current for demanding amplifier builds
  • dual symmetrical DC rails provide clean power for audio circuits
  • integrated rectifier and filter simplifies DIY power supply assembly
  • thickened copper traces reduce heat and voltage drop under heavy load
  • compact module fits easily into HiFi and repair projects

Specifications

No published specifications for this item yet.

Questions about this item

How much heat does the 25 A flat bridge generate under continuous load?

The board uses thickened copper traces to reduce heat and voltage drop, but the flat bridge still requires adequate heat dissipation during heavy-load operation to avoid overheating.

What AC transformer must I already own to power this board?

You need a separate AC transformer that matches the voltage your amplifier circuit requires; the module only rectifies and filters the transformer's AC output.

Will the unregulated dual-rail output work with older amplifier circuits I want to repair?

Yes, the symmetrical unregulated DC output is intended for HiFi amplifier assembly and old audio equipment repair, provided the transformer voltage matches the original design.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.