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Power Supply : DC Variable Regulator
1.25V to 30V 1A (with PCB)
using LM317T very nice ic

Circuit
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DC power supply
Switching Regulator
Variable Regulator

Source: PK kit Circuit

Circuit Regulator 1.25-30V 1A By LM317T

This Regulator 1.25-30V 1A By LM317T,
To use transformer 1-2A. IC-LM317T to Hold Heatsink.

PCB Regulator 1.25-30V 1A By LM317T