Here is an easy to build, low cost, good quality stable and adjustable power supply circuit. The circuit is ideal to use as a lab power supply. The circuit is very simple using TL431 IC, two transistors and few other components. TL431 is a three terminal adjustable regulator IC. The output voltage of this 

power supply circuit is 2.5 volt to 27.5 volt DC. T1 is a 230V AC to 25V AC transformer.

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