Motorola suggests this circuit in an 80's documentation. The circuit uses an inverter to produce a higher voltage for 9 V battery charge from a single cell.
Found in 1980s Electronic Engineering, this circuit uses common phototransistors as sensors. The...
November 2016 - Torex's new XCL219 and 220 DC-DC converters are available from Mouser Electronics...
This circuit can be used to control loads up to 500 mA from the outputs of microcontrollers such...