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Laptop Charger Circuit from 12V Battery

The post discusses a simple car laptop charger circuit for charging laptops from a 12V car battery using a IC 555 based boost converter. The idea was requested by one of the avid readers of this blog. Making a 12V to 19V Converter May I request you for a circuit diagram for a transformerless small … Read moreLaptop Charger Circuit from 12V Battery

Adjustable 0-100V 50 Amp SMPS Circuit

The high power adjustable switching power supply is perfect for the purpose of laboratory work. The topology used to design the system is switching topology – half controlled bridge. Written and Submitted by: Dhrubajyoti Biswas Using IC UC3845 as the Main Controller The switching supply is powered with IGBT transmitters and is further controlled by … Read moreAdjustable 0-100V 50 Amp SMPS Circuit

SMPS Halogen Lamp Transformer Circuit

One of the best substitutes for traditional light transformer for halogen bulbs is the electronic halogen transformer. It can also be used with non-halogen bulbs and any other form of resistive loads that does not run on RF current. Written and Submitted By: Dhrubajyoti Biswas Halogen Lamp Working Principle The electronic halogen lamp transformer works … Read moreSMPS Halogen Lamp Transformer Circuit

SMPS 2 x 50V 350W Circuit for Audio Power Amplifiers

This article will illustrate a simple procedure to devise an unregulated 50V switching SMPS symmetric power supply of 350W. This unit can be substituted with the standard audio amplifier power supply to reduce expense and also the weight. The proposed power supply works as a half-bridge with no regulation. Written and Submitted by: Dhrubajyoti Biswas … Read moreSMPS 2 x 50V 350W Circuit for Audio Power Amplifiers

Compatible LED Tube Light Circuit for Standard Ballast Fixtures

In this article we will study a simple LED tube light circuit which could be directly replaced with faulty 40 watt T17 fluorescent tubes and fitted directly on the existing fixture. Thus the circuit is compatible with all standard iron ballast fixture assemblies. How Conventional Fixtures are Wired As shown in the below diagram, traditional … Read moreCompatible LED Tube Light Circuit for Standard Ballast Fixtures

Mains 20 Watt Electronic Ballast Circuit

The post explains a simple 20 watt fluorescent ballast circuit using a single chip FAN7711 from Fairchild semiconductor. The proposed mains 220V operated, 20 watt fluorescent ballast circuit is built around an LCC resonant tank and a half-bridge network. Implementing Zero Voltage Switching The main features and operations may be understood with the following explanation: … Read moreMains 20 Watt Electronic Ballast Circuit

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