Found in a 1980s documentation, this amplifier uses an integrated circuit that is not easy to obtain now as it is of the era. The circuit is intended for FI ceramic filter circuits.
It can be obtained from Mouser Electronics new transceiver modules long range (LORA) Microchip...
This circuit keeps the courtesy lights of a car on for a while after the doors are closed. The...
In the figure we have a high input impedance stage with a general purpose PNP transistor. An NPN transistor...