SURGE PROTECTION CIRCUIT PRINCIPLE and DESIGN

Posted on February 16, 2017February 16, 2017 by electronicsbeliever

Surge protection circuit is the one referred by many as protector for voltage spikes in AC grid lines; however it is not limited particularly in AC grid lines. Surge protector or surge protection devi... Read More

NPN Transistor Principles and Practical Uses

Posted on February 2, 2017February 16, 2017 by electronicsbeliever

Basic NPN Transistor Principles Universities are covering this topic very well but despite I still attempt to discuss NPN transistor principles that I think easier to understand for non technical peop... Read More

Capacitor as ESD Protection

Posted on February 12, 2016February 12, 2016 by electronicsbeliever

Electrostatic discharge or simply ESD is a universal problem in electronic circuits. Capacitor as ESD protection is providing economical solution to the problem. I used to work in automotive electroni... Read More

Transistor Operation Mode Determination

Posted on December 9, 2015 by electronicsbeliever

Transistor operation mode is can easily be determined by using mathematical equations. Don’t worry; these are not difficult equations. There are three operation modes to operate the transistor. Thes... Read More

Heat Sink Thermal Resistance Calculation Easy Explanation

Posted on November 26, 2015November 26, 2015 by electronicsbeliever

For power devices like power MOSFETs, power BJT and power diodes, heat sink is very important to provide thermal relief. From the name itself, it will sink the heat from the power devices and help con... Read More

MOSFET RDSon Temperature Coefficient Usage and Interpretation

Posted on November 23, 2015November 23, 2015 by electronicsbeliever

MOSFET RDSon temperature coefficient is positive. Meaning, it will increase with increasing temperature. In this article I will discuss and interpret MOSFET RDSon temperature coefficient that is often... Read More

NPN Transistor Biasing Tool and Checker in Excel

Posted on November 18, 2015November 18, 2015 by electronicsbeliever

In this article I will discuss the feature of the NPN transistor biasing tool and checker in excel that I made. This is very useful for design engineers that don’t want to perform simulations and lo... Read More

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

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Category: Electronics