Nearly every single electronic circuit requires a separate power supply, which is often in the form of a battery or a rectified power supply. In this article we are going to discuss how to make small transformers which are typically applied in mains-operated power supplies, such as step down transformers Introduction This will likely help […]
AC to DC Adapter
Over Current Cut-off Power Supply Using Arduino
In this post we are going to construct a battery eliminator / DC variable power supply which will automatically cut-off the supply, if the current flow through the load exceeds the preset threshold level. By Girish Radhakrishanan Main Technical Features The proposed over current cut-off power supply circuit using Arduino has 16 X 2 LCD display, […]
Compact 12V 2 Amp SMPS – Step Wise Tutorial
In this post we comprehensively discuss a simple 12V 2 amp SMPS circuit using the IC UC2842. We study a 2 amp flyback design by evaluating various formulas, which provides the exact selection details for the transformer winding and the parts specifications Let’s try to understand the functions and criticalities of a few of […]
0-40V Power Supply – Construction Tutorial
This multipurpose general purpose supply generates as much as 2.5 amps from zero to 20 volts or up to 1.25 amps from 0-40 volts. Current limiting is variable within the entire range for either output options. By Trupti Patil Power Supply Main Specifications: AN IDEAL POWER SUPPLY must provide a voltage that is variable […]
50V Adjustable Transformerless Power Supply
A simple yet efficient 220V operated transformerless 50V adjustable power supply circuit using a single IC SR087 is discussed in the following article. The design does not depend on high value capacitors or inductors and yet is capable of delivering 100mA current to the attache load. Main Features and Board Layout The Main features […]
Low Dropout Voltage Regulator IC KA378R12C
The article explains the pinout functions, and datasheet of a versatile low dropout voltage regulator IC KA378R12, and also presents a circuit diagram showing how to use the IC in practical applications. A related question was asked by Mr. Jon, which inspired me to update this post. The question can be seen in the following […]
LM317 Variable Switch Mode Power Supply (SMPS)
So far in this website we have studied LM317 based linear power supply circuits, here we will learn how an LM317 can be executed as a variable switch mode power or SMPS with zero loss. LM317 as Linear Regulator We all know that an LM317 IC is internally designed to work as a linear voltage […]
Transformerless 0-400V Power Supply
A cool 0-400V variable transformerless power supply circuit can be built using just a single chip LR8, and a few resistors. The IC features a built in current control stage which makes the design extremely safe even for critical electronic circuits. How LR8 IC is Designed to Work The IC LR8 is quite similar to […]
Push-Button Variable Power Supply
In this post we learn how to make a LM317 variable power supply circuit with push buttons for enabling digitally controlled voltage selection. We eliminate the use of mechanical pot and replace it with a couple of push buttons for the up/down selection of the desired voltage levels. LM317 Basic Power Supply Designs You might […]
0-60V LM317HV Variable Power Supply
The high voltage LM317HV series of ICs will allow to go beyond the traditional voltage limits of an LM317 IC and enable controlling supplies that may be as high as 60V. 0-60V Regulation with a Single IC LM317 Therefore now you can build a universal 0-60V regulated power supply circuit loaded with all the essential […]
SCR Shunt for Protecting Capacitive LED Driver
The post presents an effective method for protecting capacitive LED driver circuits through an SCR shunt regulator circuit and explains how it can prevent filter capacitors from blowing of and LEDs from getting destroyed. The remedy was requested by Mr. Max Payne. Protecting High Watt LEDs Please suggest regarding 3W, 5W LED bulb circuit design fault. […]
How to Make a Mini Welding Machine for Small Welding Jobs
A small transformerless welding machine circuit can be built using a few high voltage, high value capacitors and a rectifier diode, the following article explains more on it. The idea was requested by Mr. Tun. In one of my earlier posts we came across a full fledged 100 amp SMPS welding inverter circuit for working […]
Illuminating an LED using Wireless Power Transmission
In this post we learn how to illuminate an LED using wireless power transmission. By Girish Radhakrishnan Wireless Power Technology Wireless power is an emerging technology in this present world. But the stunning fact is that it’s a century old concept. This concept was emerged by Nikola Tesla. Charging batteries through wireless power […]