From an audio signal, this circuit gets two signals of the same amplitude and opposite phases. This setting is widely used in bridge amplifiers (BTL). Transistors may be commonly used as BC series.
This circuit is from 1972 but can be implemented with BC558 transistors. The adjustment pot can be...
This elementary medium-wave radio was found in a publication from the 1970s. The handset must be...
This circuit was obtained in a manual for radio amateurs from 1975. It is a circuit that allows the...