ranges. Also contain many other built in features like low output noise, sink current capability from 1mA to 100mA, available in small and surface mount packaging etc.

In the circuit below a 10K resistor is used to set the desired output voltage. The max output current of the IC is 100mA but using a high current transistor at the output can increase the output current to many amperes. You can use a 2N3055 or similar transistor for that purpose. 

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The figure shows a simple adjustable regulated power supply using TL431 IC. TL431 is a three pin adjustable voltage regulator IC, able to deliver output voltage from 2.5v to 36V with only few external components. The built in thermal stability circuitry makes the output voltage stable on wide temperature
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Simple Adjustable Regulated Power Supply Using TL431