The circuit transistors, found in a 1974 documentation, may be the BC548. The circuit is used in quadriphonic systems to combine signals.
In fact, the maximum output current of this source depends on the transformer which can be 6, 7.5, 9...
This circuit was obtained from the 1976 Siemens Integrated Circuits Manual. It is the circuit for...
This circuit is based on the Texas Instruments LMC662 and has the function of monitoring the audio...