DIY Class D Audio Amplifier
Intro: DIY Class D Audio Amplifier
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...
STEP 4: Success!
You did it! You just built your own Class D Audio Amplifier!
Feel free to check out my YouTube channel for more awesome projects:
http://www.youtube.com/user/greatscottlab
You can also follow me on Facebook, Twitter and Google+ for news about upcoming projects and behind the scenes information:
36 Comments
AmitB6 1 year ago
ashkansheykhi661 2 years ago
SakshamG9 3 years ago
https://drive.google.com/drive/folders/1_B0tQIh58_...
talktoarijeet 3 years ago
narb08 6 years ago
Can you recommend a good alternative/equivalent to the IRLZ44N?
Alia fiori 4 years ago
AliA742 6 years ago
i am confused where should i add lm386
JohannesD22 5 years ago
Thanks
AliA742 6 years ago
found it :D
AliA742 6 years ago
can i use ir2110 instead of ir2112
FunVA_OpEd 6 years ago
Also not sure when you started this project but maybe there are better / alternative chips out nowadays? Lastly it was just certain types of components versus Stating the quality of the components that you offered as examples. Some may want to build a very high-quality amplifier using this as a guide, perhaps you can offer different classes of components that people could use from starting to professional. I think this is a great article I'm just offering suggestions where you could take it further.
FunVA_OpEd 6 years ago
Also, all these questions and comments need to be answered. If not somebody should then take the basis of this project, all the input from that, and take the next leap forward. A person wanting to create an app, or what many of these comments and questions addressed before they would create this particular project. I know such projects are evolutions, but if questions and comments go on answered on the original design unchanged, then people lose faith in that particular circuit.
attiny85 6 years ago
how did you set the dc offset on the output of the lm386??
johnyradio 6 years ago
Hi, awesome work. But, why does your sine wave sound like a sawtooth? Many audible harmonics.
SamyakJ4 6 years ago
I made it but doesn't get any output at the end of circuit and what about the connection of audio jack (how we can identify the 3 pins out of 5...) please suggest .. any one help me
CarlosL210 6 years ago
Is the power source a 12v car battery?
GreatScottLab 6 years ago
I used my lab bench power supply set to 15V.
SamyakJ4 6 years ago
what about current ? ... 1 Amp or what
DmitriyU2 6 years ago
Great instructable and amazing video! Thank you!
What is missing, from my point, is a test for max power output, and distortions analysis.
bassbindevil 6 years ago
Also, signal to noise measurements, and frequency response. RMAA could do that using a computer sound card, except there is the problem of the bridged output. I'd try a sound card with optical input and a battery-powered ADC with optical output (eBay, analog digital audio converter).
I suspect performance will be unimpressive, since there's no feedback. Suitable for a vehicle PA horn or siren, the kinds of music production applications where distortion is a good thing, or a science fair project. If you actually want to listen to music, there are awesome little class-D amp boards from China for the price of a burger combo.