In this project I will show you why a class AB amplifier is pretty inefficient and how a class D amplifier on the other hand improves this efficiency. At the end I will show you how we can apply the theory of operation of a class D amp to a couple of common components in order to create our own DIY class D audio amp. Let's get started!

Step 1: Watch the Video!

The video gives you all the information you need to build your own class D audio amp. During the next steps however I will present you some additional information to make the project even simpler.

Step 2: Order Your Components!

Here you can find a parts list with example sellers (affiliate links):

Ebay:

1x 3.5mm Audio Jack: http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

1x 10kΩ Potentiometer: http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

1x LM393 Comparator: http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

1x TLC555 Timer: http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

1x 74HC04 Inverter: http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

1x IR2113 MOSFET Driver: http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

2x IRLZ44N MOSFET: http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

1x 7805 Voltage Regulator: http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

1x 7812 Voltage Regulator: http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

2x PCB Terminal: http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

3x 47µF, 1x 22µF Capacitor: http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

7x 220nF Capacitor: http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

3x UF4007 Diode: http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

2x 10kΩ, 2x 10Ω, 1x 2kΩ Resistor: http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

2x 33µH Inductor: http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

Aliexpress:

1x 3.5mm Audio Jack: https://s.click.aliexpress.com/e/_dYyosJz

1x 10kΩ Potentiometer: https://s.click.aliexpress.com/e/_dX83GAF

1x LM393 Comparator: https://s.click.aliexpress.com/e/_d7ObgpD

1x TLC555 Timer: https://s.click.aliexpress.com/e/_dTrUY9D

1x 74HC04 Inverter: https://s.click.aliexpress.com/e/_d8c7LDl

1x IR2113 MOSFET Driver: https://s.click.aliexpress.com/e/_d7SJq6b

2x IRLZ44N MOSFET: https://s.click.aliexpress.com/e/_dWhSrDl

1x 7805 Voltage Regulator: https://s.click.aliexpress.com/e/_dXSrfiP

1x 7812 Voltage Regulator: https://s.click.aliexpress.com/e/_d8OcXHl

2x PCB Terminal: https://s.click.aliexpress.com/e/_dYbstfZ

3x 47µF, 1x 22µF Capacitor: https://s.click.aliexpress.com/e/_d7dOwRz

7x 220nF Capacitor: https://s.click.aliexpress.com/e/_dU4FEsB

3x UF4007 Diode: https://s.click.aliexpress.com/e/_dYR45Bh

2x 10kΩ, 2x 10Ω, 1x 2kΩ Resistor: https://s.click.aliexpress.com/e/_dTPpXjt

2x 33µH Inductor: https://s.click.aliexpress.com/e/_d6A4mKL

Amazon.de:

1x 3.5mm Audio Jack: http://amzn.to/2rpKbHN

1x 10kΩ Potentiometer: http://amzn.to/2rT8PSN

1x LM393 Comparator: http://amzn.to/2rG3dKL

1x TLC555 Timer: http://amzn.to/2qUBsd9

1x 74HC04 Inverter: http://amzn.to/2rGfizn

1x IR2113 MOSFET Driver: http://amzn.to/2rpQWtr

2x IRLZ44N MOSFET: http://amzn.to/2rT1X7R

1x 7805 Voltage Regulator: http://amzn.to/2ryYCI3

1x 7812 Voltage Regulator: http://amzn.to/2qUK5EG

2x PCB Terminal: http://amzn.to/2qQ1ymz

3x 47µF, 1x 22µF Capacitor: http://amzn.to/2qPYdE6

7x 220nF Capacitor: http://amzn.to/2rGg1k5

3x UF4007 Diode: http://amzn.to/2qUxLnM

2x 10kΩ, 2x 10Ω, 1x 2kΩ Resistor: http://amzn.to/2ryTxiV

2x 33µH Inductor: http://amzn.to/2rG8wtn

Step 3: Build the Circuit!

Here you can find the schematic of the project with and without the LM386 preamplifier. Feel free to use the pictures of my finished perfboard circuit as a reference.

You can also find the schematic on EasyEDA: https://easyeda.com/editor#id=74409197e62e4ff6b09d...