Description

+/-15V & +12V Regulated Power Supply

This project allows you to have a +/-15V rail for a preamp and a +12V rail for powering some relays, etc. for input switching in an amplifier. It uses the LM317/337 adjustable regulators to do the job.

Note: Do NOT exceed an input voltage of +/-40V

To calculate the resistor value of R1, R3 and R5 for each regulator for a different output voltage is as follows:

R = 240 * ((Vout / 1.25) - 1)

where 240 is the resistor value of R2, R4 or R6 Vout is the desired output voltage and 1.25 is the internal regulator's reference voltage.

Example for say 9V:

R = 240 * ((9 / 1.25) - 1) = 1488 (1.5k, close enough)

Link to the video on this PCB:

https://www.youtube.com/watch?v=buCCGII_CdA

Schematic and Layout

Schematic

reg-schematic.png

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Apr 29,2024

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+/-15V & +12V Regulated Power Supply

2 Layers PCB 81.28 x 47.689 mm FR-4, 1.6 mm, 1, HASL with lead, Blue Solder Mask, White silkscreen

Need a regulated supply for a preamplifier? This will do what you need!

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Published: Apr 29,2024

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