The Power-686 is a power supply intended for use with the Modulus-686 power amplifier and similar high-power amplifiers. This power supply provides twice the capacitance of the smaller Power-86 and uses individual diodes, each with its own heat sink, rather than a single integrated diode bridge. Thus, the Power-686 is well suited for a stereo Modulus-686 and also a good candidate for multi-channel Modulus-86 builds.

Technical Documentation

Design Documentation

• Features

• The key features of the Power-686 are:

  • Optimized PCB layout with copper planes and pours to minimize parasitics.
  • Simple capacitor snubber to minimize diode switching noise. Option for CRC snubber for advanced builders.
  • Four discrete diodes with individual heat sinks.
  • Four 22000 µF, 50 V reservoir capacitors. Snap-in capacitors up to 40 mm in specified diameter supported.
  • Power on indicator LED output.
  • JST connectors for connecting Modulus-286 and other amplifiers.
  • Detailed documentation describing how to identify the various windings on an Antek AN/AS-series power transformer and connect the transformer correctly.
  • Bill-of-materials available as a link to a project set up with Mouser Electronics for ease of parts ordering.
  • 3.3″ × 5.7″ (84 × 145 mm) footprint. The assembled board measures approximately 57 mm in height.
  • Gold plated PCB, made in Canada.

  Build budget: The cost of the parts is a bit over $80. The Kit contains all parts necessary to populate the circuit board. In addition to these parts you will need a dab of thermal grease such as Arctic Silver commonly available at computer parts stores.