In this post we learn about a simple surge voltage protector circuit using a fuse and a triac crowbar circuit and also learn the method to record and measure the last maximum surge that could have destroyed the specified load in case the protection was not introduced. The idea was requested by Mr. Akram. How Read More
Surge Suppressors
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How to Select MOV
MOVs or metal oxide varistors are devices designed for controlling mains switch ON surges in electrical and electronic circuits. Selecting an MOV for a particular electronic circuit might require some consideration and calculation, let’s learn the procedures here. What are MOVs Metal oxide varistors or simply varistors are non-linear surge suppressor devices which are used Read More
Thermistors
The thermistor name has been devised as a short form for the “thermally sensitive resistor”. The full form of the thermistor provides the general and the detailed idea of the action which is the feature of the thermistor. By: S. Prakash The various different types of the devices in which the thermistor are used include Read More
Zero Crossing Transformerless Power Supply
The post explains the importance of a zero crossing detection in capacitive transformerless power supplies in order to make it completely safe from the mains switch ON inrush surge currents. The idea was proposed by Mr. Francis. Technical Specifications Dear Sir, I have been reading about the transformer less power supply articles on your site Read More
Voltage Stabilized Transformerless Power Supply Circuit
The post explains how an ordinary capacitive power supply may be transformed into a surge free voltage stabilized or variable voltage transformerless power supply applicable for almost all standard electronic loads and circuits. The idea was requested by Mr. Chandan Maity. Technical Specifications Dear Swagatam, If you remember, I communicated you sometime before with comments Read More
Calculating Capacitor Current in Transformerless Power Supplies
You may have studied countless transformerless power supplies in this blog and in the web, however calculating the crucial mains capacitor current in such circuits has always remained an issue for the many constructors. Analyzing a Capactive Power Supply Before we learn the formula for calculating and optimizing the mains capacitor current in a transformerless Read More