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LM317 current amplification 6.5A

Overview

The initial design of this power supply was driven by the fact that many buck converters sold online either have too small an input voltage range or too small an output current, making them unable to power multiple modules or servos. Fortunately, I had the LM317 chip on hand, which supports a relatively wide input voltage range of 1.2-37V and an output current of 1.5A. Combined with the Darlington transistor TIP127 for current amplification, it can theoretically output 6.5A of current. Finally, I no longer worry about it not being able to power the servos. Adjusting the potentiometer changes the output voltage of ADJ. If a larger current is needed, two Darlington transistors can be connected in parallel. For high current, heatsinks should be added to the transistors. Ripple rejection ratio is 10dB-14dB.
VIN: 1.2-37V
VOUT: 3V/ADJ

Design Files

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Update:2026-03-26 17:54:31

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