LED constant current source circuit diagram using LM317
Source: InternetPublisher:拳制龙 Keywords: lm317 constant current source comprehensive power supply Updated: 2021/08/16
This circuit diagram is a LED constant current source circuit diagram using LM317. LEDs must be powered by a constant current, otherwise they are prone to aging and damage. You can use LM317. The principle is to use the 317's starting voltage to detect the constant voltage, and then remove the resistance to get the constant current value. You can connect as many lights as needed. Changing R1 can change the current, current = 1.25/R1. The circuit is shown in the figure below.
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