Input Smoothing Capacitor / Filter: The rectified voltage from the rectifier is a pulsating DC voltage having very high ripple content. Rectifier: The power output of the transformer is in AC, this needs to be converted to a DC.The bridge rectifier converts AC into DC. It is used to step down the voltage.This also serves to isolate the power supply from the mains input for safety. Transformer: The transformer changes the ac mains voltage to a desired value. The main elements of the linear power supply are: Output current: 2mA - 3A continuously adjustableīefore heading in to the making process, you should know the basic components of a Linear Power Supply. Output voltage: 0 to 30V continuous adjustable It even contains a current limit circuit which can effectively control the output current from 2mA to 3A with the ability to regulate the current continuously, and this unique feature makes this device an indispensably powerful tool in the circuit lab. This is a high quality stabilized voltage supply with which the voltage can be regulated continuously, and the range in which to regulate the voltage is 0-30V. The main objective of the project is to learn how a linear power supply unit works.In the beginning,to explain the working principle of a Linear Power Supply, I have taken an example of LM 317 based power Supply.For making the final Power Supply, I purchased a Power Supply kit from Banggood and assembled it. In this Instructable, I will show you, how to make a variable lab bench power supply with a limited budget.It is a great DIY project for beginners as well as any one interested in Electronics. A bench power supply is an extremely handy bit of kit to have around for electronics hobbyists, but they can be expensive when purchased from the market.

Mac mini power supply kit