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12:22
YouTube
Sandeep Electronics
Optocoupler Resistor Calculation Explained | SMPS Feedback Resistor Formula #sandeepelectronics
Learn how to calculate the resistor values used with an optocoupler in SMPS feedback circuits. This video/article explains: Why optocouplers need a series resistor How to calculate LED current How to choose proper resistor value for PC817, EL817, TLP781 etc. Forward voltage (VF) & current (IF) considerations Example calculations for 24V SMPS ...
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