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Your doctor may cycle and monitor your usage carefully
3 Likes Robert93820 12 June 2022 06:24 8 Hi Leslie Leslie62519: Would you mind giving me the maths for that calculation so i can better learn and understand Vin or VDD = 5V LED forward drop say 2.3V 5V - 2.3V = 2.7V Current through 470 = 2.7/470 = 0.0057A or 5.7mA If you require 4mA = 2.7/0.004 = 675 or preferred value of 680 But as I say this is not particularly critical so I would follow the manufacturers example and use 470
Thats standard practice for 503A compounding and doesnt indicate a safety issue
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