Dual Power Supply Module for Audio Amplifiers

Dual power supply, ideal for powering high-power audio amplifiers in a stable and efficient way.

SKU 7100-FT1764KEAN 8219671081511Item type: Assembled, Kit

Description

This dual power supply module is designed to deliver a symmetrical DC voltage from a transformer with a dual AC output. It is particularly suited to powering high-power audio output stages.

It uses a 25 A bridge rectifier and a bank of four 4700 µF / 63 V electrolytic capacitors for effective filtering of the rectified voltage.
It includes protection fuses on both rails and a green status LED to show that the output voltage is present.

For correct and safe operation you must use a transformer with two secondary outputs rated no higher than 36Vac with a centre tap. This value keeps the voltage across the capacitors within safe limits, avoiding any risk of overvoltage and ensuring long-term reliability.

The module is easy to assemble, compact and rugged, ideal for audio applications that call for a stable, well-filtered symmetrical supply.

Important note: the transformer is not included and must be purchased separately.

Soldering is required for assembly. The kit is supplied complete with instructions.

Solder-it-yourself kit

Technical specifications
  • Protection: fuses on both rails (positive and negative)
  • Maximum output current: up to about 3.5 A continuous per rail, using a 300 W – 2×35 V toroidal transformer.
    The actual figure depends on load conditions, ventilation and the characteristics of the transformer.
Circuit diagram
Unregulated ±46Vdc dual power supply module for audio amplifiers
What this kit includes
The kit includes every electronic component needed to assemble the dual power supply module, namely: electrolytic capacitors, resistors, status LED, bridge rectifier, fast-blow fuses, fuse holders and printed circuit board.

Note: the transformer is not included and must be purchased separately (please refer to the related products for this item).

Technical details

Input voltage transformer with a secondary rated max. 36Vac + 36Vac with centre tap
Max. output voltage ±51 V DC off load
Topology unregulated dual power supply
Bridge rectifier 25 A
Filter capacitors 4 × 4700 µF / 63 V electrolytic
Voltage indicator green LED
PCB dimensions 120x100mm

You may also like…

About us

Open-Electronics.org is the brainchild of a world leader in hobby electronics Futura Group srl. Open-Electronics.org is devoted to support development, hacking and playing with electronics: we share exciting open projects and create amazing products!

Open-Electronics.org is not just a container of ideas: it is also a web site lead by a team of engineers and geeks who will take part in the discussions and give support.

Our mission is to become a reference Open Source hacking site with ideas and feedback aimed to enrich the community.