This circuit uses a dual-gate MOSFET, a rare component today. We found it in American documentation from the 1980s. The rest of the components are common.
The purpose of this circuit is to turn off the power supplied by a battery when its voltage drops...
Found in National Semiconductor documentation from the 1990s, this circuit has a 10 kHz pass band...
Found in a 1980s documentation, this amplifier uses an integrated circuit of the era. The RLC...