2021-02-14

[public] 369K views, 18.2K likes, dislikes audio only

GreatScott!

$2 for 4-Layer PCBs: https://jlcpcb.com

Previous video: /youtube/video/8u4izLA-SCo

Transistor (BJT) as a Switch video: /youtube/video/WRm2oUw4owE

Low Budget Bluetooth Music System video: /youtube/video/oGTXczCV30A

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Twitter: https://twitter.com/GreatScottLab

Support me for more videos: https://www.patreon.com/GreatScott?ty=h

More project information (schematic,.....) on Instructables: https://www.instructables.com/Building-the-Simplest-Best-Sounding-Yet-Most-Ineff/

Parts list (affiliate links):

2x BC337 NPN BJT: https://s.click.aliexpress.com/e/_9I1F1z

2x 100Ω, 2x 22Ω, 2x 3.3kΩ, 2x 1kΩ Resistor: https://s.click.aliexpress.com/e/_dTPpXjt

4x 10µF Capacitor: https://s.click.aliexpress.com/e/_d7dOwRz

1x USB Type-C breakout board: https://s.click.aliexpress.com/e/_AonKUJ

1x Audio jack: https://s.click.aliexpress.com/e/_9IfcXd

1x Audio plug: https://s.click.aliexpress.com/e/_ABC7UL

1x Perfboard: https://s.click.aliexpress.com/e/_A5V4B5

Useful sites which were partly shown in the video:

https://www.electronics-lab.com/article/class-a-amplifiers/

https://learnabout-electronics.org/Amplifiers/amplifiers21.php

https://learnabout-electronics.org/Amplifiers/amplifiers20.php

https://www.tutorialspoint.com/amplifiers/class_a_power_amplifiers.htm

https://www.electronics-tutorials.ws/amplifier/amplifier-classes.html

https://www.electronics-tutorials.ws/amplifier/amp_5.html

In this project I will be showing you how to create a class A audio amp. The great thing about such amps is that they only require a few components and sound awesome. On the other hand though, their efficiency is not that great. But since I will be creating this amp for a smartphone with a USB Type-C port for powering the amp, it should be just fine. So let me show you how to calculate a design for such an amp and how to build it! Let's get started!

Thanks to JLCPCB for sponsoring this video.

Visit https://jlcpcb.com to get professional PCBs for low prices.

Music:

2011 Lookalike by Bartlebeats

0:00 Why I want to build a class A audio amp

1:02 Intro

1:39 General circuit design

3:03 Closer look at the Base Input side

4:24 Comparison of class A, B & AB amplifiers

5:30 Closer look at the Collector Output side

6:23 Selecting the complementary components

8:34 Extra Information about class A amps

9:05 Modifying a USB Type-C board to get 5V

9:53 Practical build & End