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Topic: Adjustable Double-Output Power Supply (Linear) (Read 1 time) previous topic - next topic


Dec 31, 2019, 11:05 am Last Edit: Dec 31, 2019, 11:06 am by hesam_m

YouTube: https://youtu.be/ObFXqTvyjyU


  • AC - DC Conversion
  • Double output voltages (Positive - Ground - Negative)
  • Adjustable positive and negative rails
  • Just a Single-Output AC transformer
  • Output noise (20MHz-BWL, no load): Around 1.12mVpp
  • Low noise and stable outputs (ideal to power Opamps)
  • Output Voltage: +/-1.25V to +/-25V
  • Maximum output current: 300mA to 500mA
  • Cheap and easy to solder (all component packages are DIP)

A double output low noise power supply is an essential tool for any electronics enthusiast. There are many circumstances that a double-output power supply is necessary such as designing pre-amplifiers and powering OPAMPs. In this article, we are going to build a linear power supply that a user can adjust its positive and negative rails independently. Moreover, just an ordinary single-output AC transformer is used at the input.


Source: https://www.pcbway.com/blog/technology/Low_Noise_Adjustable_Linear_AC_DC_Power_Supply.html

[1] LM317 Datasheet: http://www.ti.com/lit/ds/slvs044x/slvs044x.pdf

[2] LM337 Datasheet: http://www.ti.com/lit/ds/symlink/lm137.pdf

[3]: Schematic Symbol and PCB Footprint for LM317: https://componentsearchengine.com/part.php?partID=248007

[4]: Schematic Symbol and PCB Footprint for LM337: https://componentsearchengine.com/part.php?partID=290650

[5]: Altium Plugin: https://www.samacsys.com/altium-designer-library-instructions

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