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DC Crowbar Over-voltage Protector Circuit

A very simple DC over voltage protector circuit is shown below. The transistor is set to monitor the input voltage applied to it from the left, in case the voltage rises above a specified limit, the transistor conducts, providing the required current to the SCR, which instantly fires, shorting the output and thus protecting the load from the hazard. … Read moreDC Crowbar Over-voltage Protector Circuit

Regulated, High Current Power Supply Circuit

The circuit given here below can be used for applications that require stringent voltage regulations and ripple rejection criteria. The transistor pair are configured such that all residual ripple factor are perfectly rectified. Circuit Operation The circuit below shows a simple way of acquiring a perfectly regulated and stabilized DC voltage output using ordinary transistors.The circuit is very simple to … Read moreRegulated, High Current Power Supply Circuit

3 Tested 220V High and Low Voltage Cut OFF Circuits Using IC 324 and Transistors

The article describes 3 accurate automatic over and under voltage cut out circuits can be made at home for protecting the domestic appliances from sudden dangerous high and low voltage influxes. The first designs explains a LM324 transformer based circuit, the second circuit uses a transformerless version, that is it works without a transformer, while … Read more3 Tested 220V High and Low Voltage Cut OFF Circuits Using IC 324 and Transistors

4 Simple Transformerless Power Supply Circuits Explained

In this post we discuss 4 easy to build, compact simple transformerless power supply circuits. All the circuits presented here are built using capacitive reactance theory for stepping down the input AC mains voltage. All the designs presented here work independently without any transformer, or no transformer. 1) The Transformerless Power Supply Concept The transformerless … Read more4 Simple Transformerless Power Supply Circuits Explained

How to Use LM317 for Making a Variable Power Supply Circuit

In this post we will elaborately discuss how to build a simple LM317 based adjustable power supply circuit using minimum number of external components. Introduction Whether it’s an electronic noob or an expert professional, an adjustable power supply unit is required by everybody in the field. It is the basic source of power that may … Read moreHow to Use LM317 for Making a Variable Power Supply Circuit

How to Calculate Transformerless Power Supplies

This post explains how to calculate resistor and capacitor values in transformerless power supply circuits using simple formulas like ohms law. Analyzing a Capactive Power Supply Before we learn the formula for calculating and optimizing resistor and capacitor values in a transformerless power supply, it would be important to first summarize a standard transformerless power … Read moreHow to Calculate Transformerless Power Supplies