Project files: Little helpers – Ground Loop Breaker

One more little helper for you guys 🙂 Once again, not exactly a major effort with this one, but I hope it is still useful.

What is it?
It’s a Ground Loop Breaker as described in this article by Rod Elliot on grounding/earthing of audio equipment.

How big is the board?
The board measures 2.0″ x 2.0″ (app. 51 x 51 mm.) This is my new semi-official standard for modular circuits like this and will allow stacking of boards 🙂

What is the status of the boards?
The board is version 1.1 as I had to replace the original bridge rectifier with a different footprint.

Does it use any special/expensive/hard-to-find parts?

Anything else I need to know?

  • Read the article and follow the recommendations on connections.
  • The rectifier bridge should be in a so-called GBPC-W package with wire leads. The rating should be 25A or higher and both the bridge and the capacitor should be rated for at least the mains voltage where you live (so 250VAC/400VDC in 230V countries)
  • The connections on the “ground” side (input) are either via the screw clamp or a couple of FAST-ON tabs. Connections on the “earth” (output) side are either via FAST-ON tabs to a dedicated ground screw or a plated-through hole that can be used to make the chassis connection. The board mounting holes are isolated. Use cables that are as short and thick as possible for all connections.

Download design files here

Related information:
Note: Always read the “intro post” for additional important information about my designs.

Be careful with working with any mains wiring and be sure to ask questions if you are not sure about anything, either in an online forum or to a local electrician (preferred).


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