1.5 to 35 Volt DC Regulated Power Supply Schematic

Here is the circuit diagram of regulated power supply. It is a small power supply that provides a regulated voltage, adjustable between 1.5 and 35 volts at 1 ampere. The circuit is ready to use, you just need to add a suitable transformer. The circuit is thermal overload protected because the current limiter and thermal overload protection are included in the IC.

The Circuit

circuit diagram

Transformer chart

Parts:

Resistors
R1 = 120R
P1 = 4.7K-Potmeter

Capacitors
C1 = 100nF - 63V
C2 = 1uF - 35V
C3 = 10uF - 35V
C4 = 2200uF - 35V

Semiconductors
IC = LM317
D1 = 1N4007
D2 = 1N4007
D3 = 1N4007
D4 = 1N4007

Features:

    * Just add a suitable transformer (see table)
    * Great to power your projects and save money on batteries
    * Suitable as an adjustable power supply for experiments
    * Control DC motors, low voltage light bulbs, …

Specifications :

    * Preset any voltage between 1.5 and 35V
    * Very low ripple (80dB rejection)
    * Short-circuit, thermal and overload protection
    * Max input voltage : 28VAC or 40VDC
    * Max dissipation : 15W (with heatsink)
    * Dimensions : 52x52mm (2.1” x 2.1”)

Note:

    * It has not to be cooled if used for small powers. 28 Volt AC max is allowed for the input voltage.

from :  http://extremecircuits.blogspot.com