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Finder 30-22
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README.md

PC817

VF (IF 20mA) = 1.2V

BC547B

hFE = 200-450
IC (max) = 100mA
VBEsat = 0.7V

Finder 30-22 5V

UN = 5V
R = 125Ohm
I @ UN = 40mA

Resisitors

R1

R = (Vin - VF) / IF
R = (3.3V - 1.2V) / 0.02A
R = 105 Ohm

R2

R = (V_RLY - VBEsat) / (I@UN / 10)
R = (5V - 0.7V) / (0.04 / 10)
R = 1075 Ohm
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