LM317 constant current source

This project shows how to build a constant current  source based on two LM317 ICs. The purpose was to power two sets of 28 LED’s tied in parallel from a 12V source. The PCB design is done on Eagle and the current is set to 20mA for each led so that is 560mA for each set of LED’s. Check the design on the link below.

LM317 constant current source – [Link]

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