Ground Loop Isolator, Hum Eliminator

Ground Loop Isolator, Hum Eliminator, Buffer
Eliminate ground loop hum & run long cables.
This small buffered isolator is used for removing hum caused by ground loops and is suitable both for bass & guitar or any other signal at instrument level or even lower line-level signals.
In case you have a ground loop you want to break (e.g. when using two amps simultaneously) simply connect this isolator in the right place and this will stop the hum. The isolation is achieved with the use of an audio transformer with flat response, (20Hz-20kHz) and can be engaged with a toggle switch.
When the isolation switch is set to OFF the device serves as a buffer. When the isolation is set to ON the output can be connected either to a balanced or to an unbalanced device. A  phase reverse switch is also available in case you need to flip the phase of your signal (useful if using multiple amps).

The circuit makes use of high impedance audio JFET transistors to achieve very high input impedance and very low output impedance ensuring the perfect impedance load on your instrument's pickups, while also sending the exact signal to your amp. Besides the isolation it also offers signal buffering and the capability of running long cables in the output.

▹ Input impedance: 3 MΩ
▹ Output impedance: < 1kΩ
▹ When Isolation = ON the output can be connected to either a balanced or an unbalanced device.
▹ Unity gain
▹ Frequency response: flat @ 20Hz-20kHz
▹  Voltage Required: DC 9-18 Volt (Use 12-18V if you need more headroom)
[Do not exceed recommended voltage! It may damage the circuit.]
▹ Polarity: negative tip
▹ Current Draw: 2mA @ 9V
▹ Weight: ~88 gr
▹ Enclosure Dimensions: 52 x 56 x 23 mm (not counting the protruding jacks and switches)
▹ Anodized Aluminum Enclosure (grounded at the input)