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.
This circuit was found in an old American documentation aimed at amateurs. The circuit generates...
Found in a 90s EDN, this circuit is indicated for power control through a 4-20 mA line. The...
Found in a 90s documentation, this circuit triggers the SCR when there is an overvoltage in order...