This is a Simple Soft Start For Switching Power Supply Project. Switching power supply whose output voltage is appreciably lower than its input voltage has an interesting property: the current drawn by it is smaller than its output current. However, the input power (UI) is, of course, greater than the output power. There is another aspect that needs to be watched: when the input voltage at switch-on is too low, the regulator will tend to draw the full current. When the supply cannot cope with this, it fails or the fuse blows. It is, therefore, advisable to disable the regulator at switch-on (via the on/off input). until the relevant capacitor has been charged. When the regulator then starts to draw current, the charging current has already dropped to a level which does not overload the voltage source. Soft Start For Switching Power Supply Circuit diagram: Soft Start Circuit For Switching Power Supply The circuit in the diagram provides an output voltage of 5 V and is supplied by a 24 V