Common Application of Optocoupler in Today’s Electronic Circuits

Posted on May 4, 2015September 29, 2015 by electronicsbeliever

The most common application of Optocoupler is signal isolation. It provides complete isolation because its input side is not electrically connected to the output side. Its input side is a light source... Read More

Disadvantage of using Optocoupler with Low CTR for Switch Operation

Posted on May 4, 2015June 20, 2015 by electronicsbeliever

In optocoupler, CTR stands for current transfer ratio. This is comparable to the current gain beta in BJT. This is the most important parameters of an optocoupler to function normally. There are sever... Read More

Optocoupler Device CTR and Circuit CTR Explained

Posted on April 30, 2015June 19, 2015 by electronicsbeliever

When you already heard about Optocoupler devices, you may be heard also about CTR. CTR stands for current transfer ratio. In bipolar junction transistor this is the so called current gain or simply be... Read More

Optocoupler Operation as Switch Tutorials with Design Sample

Posted on April 30, 2015February 11, 2016 by electronicsbeliever

The optocoupler operation as switch is similar on how to configure BJT as switch. For a BJT to operate as switch it must be set to function in saturation and cut-off. Optocoupler as well. However in B... Read More

How to Determine Optocoupler Operation Saturation or Linear

Posted on April 29, 2015January 1, 2017 by electronicsbeliever

There are several ways on how to determine Optocoupler operation. The old school method is to build an actual circuit and measure the collector-emitter voltage. If the reading is low enough (equal to ... Read More

Optocoupler Circuit Design and Detailed Analysis

Posted on April 28, 2015September 29, 2015 by electronicsbeliever

Actually, Optocoupler circuit design is not that difficult as some thought. It’s just like you are designing a BJT circuit. If a BJT has its beta or current gain, optocoupler has its CTR or current ... Read More

How to Bias Optocoupler: The Complete Course

Posted on April 28, 2015September 26, 2015 by electronicsbeliever

How to bias optocoupler is even simpler than bipolar junction transistors. However such device is not well discussed in the universities making people believe that it is a difficult device to deal wi... Read More

Factors Affecting Current Transfer Ratio of Optocoupler

Posted on December 20, 2014April 26, 2015 by electronicsbeliever

Current transfer ratio is comparable to BJT’s HFE or beta (β). This is the ratio of the optocoupler’s collector current to the forward current. Current transfer ratio is popular by its ab... Read More

Opto Coupler CTR Explanation

Posted on December 1, 2014April 26, 2015 by electronicsbeliever

Opto coupler CTR explanation is not well elaborated by other authors and before I was also having hard time of understanding what is it. Current transfer ratio or commonly known as CTR is the ratio of... Read More

How to Analyze Optocoupler in Feedback System

Posted on November 22, 2014March 20, 2016 by electronicsbeliever

One of the usual applications of optocoupler is to provide isolation between two ground reference. That is why it is often seen in power supply feedback circuit. How to analyze optocoupler in feedback... Read More

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Category: Optocoupler