This circuit was obtained from the 1976 Siemens Integrated Circuits Manual. It is the circuit for applying the TBA400 as a broadband amplifier.
This circuit protects the speakers in case the amplifiers have problems. With a continuous voltage...
We found this circuit in an American documentation from the 60's. The transistors are made of...
This circuit provides a signal when dialing occurs. The circuit is powered by the telephone line...