How to Get 15V 0.36A Output Using LM317 for Philips Trimmer Adapter Design?

The discussion focuses on designing a 15 V DC, 0.36 A power supply for a Philips trimmer adapter using the LM317 adjustable voltage regulator. The initial issue was output voltage fluctuation and insufficient current (approx. 0.0029 A) during simulation in Proteus, attributed to inadequate input filtering. Replacing the AC supply and full-wave bridge rectifier with a DC source stabilized the output voltage. Increasing the filter capacitor to 470 µF and using a 25 V transformer improved simulation results. It was noted that the LM317 can safely handle input voltages up to 35 V and deliver currents up to 1.5 A, but it requires a dropout voltage of about 3 V above the output voltage. To prevent overheating at higher currents, parallel pass transistors can be used to share the load current. Practical implementation on a breadboard and PCB confirmed the design's effectiveness in delivering the required voltage and current for the trimmer adapter. The project was completed successfully with the improved filtering and current handling measures.
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