This lead-acid battery charger was found in a Popular Electronics from the 90s. The circuit has a maximum current of 2 A, being suitable for powering inverters in emergency lighting systems.
The purpose of the diode in this oscillator circuit is to limit the amplitude of the output...
This remote control receiver via the power grid appears elsewhere on this site from other sources....
November 2016 - NXP ARM Cortex microcontrollers for serial interfacing applications, NXP 32-bit...