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50W Audio power amplifier

Class AB discrete audio amplifier

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I needed some amplifier for my new speakers, so i built one. It's designed as dual-mono - two completely independent amplifiers. Each has its own power supply and DC speaker protection on 4-layer PCB. Output power is 50W/8R with balanced supply voltage of +/- 35V, each amplifier has dedicated winding on power transformer. I've also built a simple stereo loudness control on another PCB.
It's not done yet, I'm currently working on enclosure and mechanics.

You can find original schematics here and here (only in Slovak and Czech language). I'm not the author of these circuit, i just made some modifications.

sch - 267.07 kB - 03/26/2021 at 22:16

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brd - 38.74 kB - 03/26/2021 at 22:16

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x-zip-compressed - 38.19 kB - 03/26/2021 at 22:16

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sch - 1.67 MB - 03/26/2021 at 22:10

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brd - 189.87 kB - 03/26/2021 at 22:10

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  • 3D printed chassis

    Miroslav Hancar04/19/2021 at 19:08 0 comments

    I 3D printed a simple front and rear panel, top cover and potentiometer knob. Unfortunately, panels are a bit warped but it doesn't look so bad. Heatsinks are mounted on wood board.

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