This circuit was found in an Elektor from the 90s. The circuit is critical, requiring a very well-planned layout for correct operation.
This circuit for controlling high power in the AC network was found in a Motorola documentation from 1968....
This amplifier is specifically designed for portable radio and recorders with a 4 ohms load....
This circuit was found in a 1973 Radio Elettronica magazine. The Italian magazine no longer...