Dc power supplies-Introduction

jojo September 8, 2009 3 Comments
General Introduction to DC power supplies: The electrical power is almost exclusively generated, transmitted and distributed in the form of ac because of economical consideration but for operation of most of the electronic devices and circuits, dc supply is...
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Mains failure alarm circuit

admin March 8, 2012 20 Comments
 Description. Here is a simple mains power failure alarm/detector circuit that produces an alarm whenever the mains supply fails. Lot of such circuits are available, but the peculiarity of this circuit is that it requires no back up power...
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9 V regulator using 7809

admin March 7, 2012 53 Comments
Description. Here is the circuit diagram of 9 V regulator using popular 7809 IC. The 7809 is a 9 Volt voltage regulator IC with features such as internal current limit, safe area protection, thermal protection etc. A 16 V...
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5V power supply using 7805.

admin March 7, 2012 23 Comments
Description. 7805 is a 5V fixed three terminal positive voltage regulator IC. The IC has features such as safe operating area protection, thermal shut down, internal current limiting which makes the IC very rugged. Output currents up to 1A...
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Transformerless power supply circuit

jacky February 24, 2011 17 Comments
Transformerless power supply Description. Here is a low cost and simple circuit that can be used to power up small electronics devices. The power is directly tapped from the mains via resistor R1.D1 rectifies the voltage and C1 and...
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6 Volt regulator circuit using 7806

admin February 23, 2011 25 Comments
6 Volt Regulator using IC 7806 Description. Here is the elementary 6V 1A power supply circuit using 7806 IC. The 7806 three-terminal positive voltage regulator is available in the TO-220/D-PAK package making them useful in a wide range of...
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Power Supply Circuit using LM 317

admin October 17, 2018 11 Comments
Power Supply Circuit-40 Volts-2A LM317 is a widely used linear voltage regulator. It has 3 pins; input, output and adjustment. LM317 are energy wasters and always require a heat sink to keep the temperature of the circuit low. But...
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