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 transistor radio was manufactured in the 60s and has 6 transistors from that time. The...
This circuit indicates the logic level of a digital signal. LEDs can replace the lamp, wired with...
This circuit is from the 1977 GE semiconductor manual. The components used are uncommon today....