{1145} Optocoupler Current transfer ratio CTR

In this video number {1145} Optocoupler Current transfer ratio CTR . I explained current transfer ratio CTR in optocouplers. What is Current Transfer Ratio (CTR)? Current Transfer Ratio (CTR) is a ratio of the current to the output collector and input forward current and is represented in a percentage. CTR is mainly characterized in analog opto-emulator or optocoupler devices. if we apply input forward current to the LED and apply voltage to the collector-emitter, the output collector current can be measured. Current transfer ratio is a parameter, that is similar to the DC current amplification ratio of a transistor beta or (hFE) and is expressed as a percentage indicating the ratio of the output current (IC) to the input current (IF).
CTR(%) = (IC/IF) x 100
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[@t1d100]

Ahh... Thank you, Haseeb! I think that I have mentioned to you that I am a self-taught EE hobbyist and, as such, I have gaps in my knowledge base. Here, you are filling in one of my gaps. Wonderful! Thank you! Since you introduced my to the 817, many videos ago, I am finding all sorts of uses for it. It is becoming one of my favorite components. Presently, I am designing and breadboarding a H-Bridge Stepper Motor Driver. It is so simple... The LED of the 817 is driven directly by the pin of a MCU, because the LED requires so little current.The transistor of the 817 drives the MOSFETs. Beautiful. And, all possible, because of your teachings! Again, thank you! Watching the video, it became clear as to why the CTR is so important... It is because both the LED and the Transistor of the 817 are current driven devices. Maybe that realization will help someone else's thinking, too. I hope so. Also, IIRC, optocouplers come in all sorts of output types, such as MOSFETs. So, check around, if a transistor output is not quite what you need. Cheers!

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