This circuit interfaces audio signals with 50-ohm lines. The source must be symmetrical and the PNP transistors can be the BC558 and the NPN the BC548. The circuit is from a 1978 publication. The signal cables must be shielded.

This circuit interfaces audio signals with 50-ohm lines. The source must be symmetrical and the PNP transistors can be the BC558 and the NPN the BC548. The circuit is from a 1978 publication. The signal cables must be shielded.