This universal power supply circuit provides a variable voltage between 3-30 V. The power supply provides maximum current 1.5 A and with a few modifications and additions to modules can provide a higher current. (more…)
Universal power supplies must operate from AC line voltage, whose value can range from 90 to 264 V, 50 or 60 Hz. The rectified input voltage from the diode bridge filter capacitor charges up to 120 ... 370 VDC. Voltages of this level is a serious threat to personnel conducting the layout or repair of the power supply. It is desirable to discharge the filter capacitor after the power and thus secure the work of serving the power supply.