Simple Variable Power Supply 0-15VDC / 1A

Simple Variable Power Supply 0-15VDC / 1A circuit diagram

This is the very simple general purpose variable power supply capable of delivering 0-15V DC output with about 1A electric current. The power supply circuit has regulated output and can be used for most small electronic circuit application.

This power supply circuit is very simple in construction, finding materials, easy and low cost. The output voltage is stabilized and regulated in the range of 0V to +15 V, supplied with a maximum current of 1 A. The adjustment is done in potensiometer R2. The Q1 is a classic power transistor and needs to be mounted on heatsink, and a constantly heated when working in the area of the peak current. The type of transformer is standard and can be found easily the market. The 4 rectifier diodes 1N4007 can be replaced with a standard 1A bridge diode.

Parts List:

R1 = 56ohm 2W
R2 = 330ohm Linear Potensiometer
C1 = 2200uF/35V
C2 = 100uF/35V
C3 = 10uF/25V
C4 = 220uF/25V
C5 = 100nF
GR1 = 4 x 1N4007
Q1 = 2N3055
T1 = 220V@18V 1.5A
D1 = 18V 1.5W zener

Simple variable power supply 0-15VDC / 1A, schematic diagram source:

About Power Supply
A power supply is a device that supplies electrical energy to one or more electric loads. The term of "power supply" is most commonly applied to devices that convert one form of electrical energy to another, though it may also refer to devices that convert another form of energy (e.g., mechanical, chemical, solar) to electrical energy.
A power supply may be implemented as a discrete, stand-alone device or as an integral device that is hardwired to its load. In the latter case, for example, low voltage DC power supplies are commonly integrated with their loads in devices such as computers and household electronics. More explanation about power supply can be found at

This is the tutorial about "How to build an AC to DC power supply ". The video tutorial covers the basics of diodes, bridge rectifiers, and how to build simple unregulated AC to DC power supplies than can handle a few mA up to several Amps.

Watch the video: