Kramer debuts isolation transformers

Kramer Electronics has introduced four isolation transformer models — the TR-1, TR-1A, TR-2A and TR-3 — that eliminate noise in AV signals caused by ground loop problems.

In many video and audio applications, the connection between sources and displays can introduce a 50Hz or 60Hz ground loop resulting in unwanted video hum bars or audio hum or buzz. Kramer’s isolation transformers — the TR-1 for composite video signals, the TR-1A for balanced mono audio signals, the TR-2A for balanced stereo audio signals and the TR-3 for composite video and balanced stereo audio signals — break the ground connections in AV transmission lines to eliminate hum caused by ground loops.

These isolation transformers remove both DC potentials and common noise that can result from long cable runs. Each model offers various grounding options. The TR-1 and TR-3 have ground connection for the video signal so the unit can be attached to an external ground, and the TR-1A and TR-2A have dip switches so the left and right audio in and out signals can be grounded.

For more information, visit