DIY by Mr. Suky.

  My first Switching Power supply AC to DC Converter Project. PCB and schematic from Link. http://www.un-sound.com/board/index.php?topic=1446.msg26160#msg26160 PCB Layout PCB Bottom Layer Power Output +- 71 V DC follow My blog : Led tv Buyer Guide

Schematic for TDA7294 Power chip amp Project Datasheet for TDA7294 you can search from www.alldatasheet.com Print PCB layout by laser printer to paper and ironing to PCB     finishing PCB  ready to drill.   Back of PCB  place resistor 22k between pin 2 and 14

The B1 Firstwatt buffer preamp is a popular DIY audio project that delivers high-quality sound with minimal distortion. By building your own B1 buffer preamp, you can experience the joy of DIY audio bliss and customize your system to meet your specific audio needs. In this article, we'll provide a comprehensive guide to building your own B1 Firstwatt buffer preamp, including an introduction to the circuit design, a list of required materials, step-by-step instructions for building the preamp, and tips for testing and fine-tuning your system. Low cost DIY B1 Firstwatt Buffer Preamp Clone Project   Schematic and PCB Design by ammchor   http://www.htg2.net/index.php?topic=32225.msg379337#msg379337 12 V AC Adaptor     Power Amp TDA 7294 for test. Power Supply for TDA7294   Test with Soken low cost speaker.