This circuit was found in an Electronics Now from the 90's. The integrated regulator circuit and the power transistor must be equipped with heat radiators.
For inductive loads we have the configuration shown in the figure. Note that the optical coupler...
This is one of many Morse code audio oscillators that can be found in this section. The circuit...
August 2017 - Mouser Electronics has already for dispatch Microchip MIC28515 Controlled Regulators for...