This circuit can be made into a regulated power supply for voltages from five volts up to twenty-four volts. The user must add any of the standard 78xx TO-220 positive voltage regulators (7805 or 7806 or etc...thru 7824) and the voltage will equal which ever part you select (the last two digits of the number indicates voltage; 7805 = five volts etc.) . You Input AC or DC (unregulated) about three volts greater than desired output voltage; complete instructions included. The 7800 series outputs up to 1 ampere typically. LED indicator and onboard on/off switch. You could use this with a junk box AC or DC power supply or supply your own transformer etc..