The Palmer Audio PLI01 is a mono isolation transformer (line isolator), equipped with 1/4" TRS jack sockets at both ends for balanced and unbalanced signals. Especially suitable for eliminating ground loops that cause hum. Conversion from unbalanced to balanced is possible. A two-channel version can be found under product number PLI05. Single channel unit in a small rugged diecast box. Especially useful in guitar rack systems where multiple signal processors and preamplifiers are combined. Also eliminates noise in car hifi when used to isolate power boosters.
A Great Example for Eliminating the Guitar Amp Buzz
A common example for using the Palmer PLI01 is when you've set up an A/B box to split your guitar signal to two amplifiers. Plugging in each amp to AC-power with a standard 3-prong cable and two standard guitar cables for amp connection from the sends of the A/B box can create a ground loop and the all too famous buzz. Putting a Palmer PLI01 isolation transformer on the instrument cable path running from the A/B box to the second amp's input will break the ground connection by using the audio path instead of the AC power path and it's the much safer way to eliminate a ground loop.