GND - Ground link isolator


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GND replaces the old-fashioned ground 'lift' switch of olde with a modern automatic ground-link ground-isolator circuit.

  • provides a ground reference when no other is avaialbe
  • prevents ground-loops between equipment
  • provides an RF ground to reduce RF break-through
  • must be used in equipment with wired grounds not random chassis grounds

Ground loops between equipment powered from the AC mains can cause hum (50-60Hz) at the system output. Breaking safety grounds should NEVER be done and breaking signal grounds is speculative at best. GND provides a DC ground connection within the equipment it is mounted in, as all electrically powered devices must be grounded to be hum-free. When connected to another AC-powered device, GND allows that other device's ground to dominate if it is "harder" or "lower impedance" than GND. The system will again be hum-free. If every piece in the system uses a GND-style ground link-isolator, the system will again be hum-free.

GND is comprised of a few small components that are soldered together by the installer. GND is secured to the equipment chassis using a single bolt. In hand-wired amps, GND can be mounted on an eyelet or turret board.

Chassis space required: about 1x2" (25x50mm)

About London Power

London Power was founded in 1990 by Kevin O'Connor, after two decades of research into innovative audio amplification techniques. Kevin is an audio designer, author and speaker, known for his proprietary methodology called Power Scaling, and for his eleven books on audio subjects. Whether you seek amps, kits or information, you'll find useful answers here on not just the "how" but the "why" of audio amplifier design. Please enjoy the information on this site, and don't hesitate to contact us with questions.

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