Class D Amplifier Assembled!
by Ben on May.17, 2011, under Class-D Amplifier, Projects
The single-supply bridged version of the Class-D amplifier has been assembled, and I am most pleased to report that it works beautifully!
Input side of the amp
Output side of the amp
For those new to the project, a Class-D amplifier is a highly efficient amplifier that operates its output devices as switches instead of as variable resistors. We posted a highly experimental version of this project last November, and it met with a surprising amount of positive feedback from the DIY community. Therefore, we developed it as a formal project.
The amplifier has been converted into a single-supply version, which removes quite a bit of complexity from its power supply. The ideal power supply used to be a custom-built bipolar supply capable of high currents, but now, an old laptop power brick that supplies 20V at a few amps is perfect.
A short demonstration video follows. For more technical information, be sure to check out the github repository that contains a wealth of information on the development of this project.
Still remaining: packaging the project. I wanted to verify that everything worked before taking the time to stuff everything into a box.
5 Comments for this entry
5 Trackbacks / Pingbacks for this entry
-
Class-D audio amplifier makes it from breadboard to PCB | You've been blogged!
May 21st, 2011 on 5:23 PM[...] Laskowski's] been working on a Class-D audio amplifier for several months. What you see above is the most recent version of the amp. A class-D amplifier uses transistor switching (or in this case MOSFET switching) to generate the [...]
-
Class-D audio amplifier makes it from breadboard to PCB - Hack a Day
May 21st, 2011 on 5:31 PM[...] Laskowski's] been working on a Class-D audio amplifier for several months. What you see above is the most recent version of the amp. A class-D amplifier uses transistor switching (or in this case MOSFET switching) to generate the [...]
-
Class-D audio amplifier makes it from breadboard to PCB | House of Mods
May 21st, 2011 on 6:34 PM[...] Laskowski's] been working on a Class-D audio amplifier for several months. What you see above is the most recent version of the amp. A class-D amplifier uses transistor switching (or in this case MOSFET switching) to generate the [...]
-
Class-D audio amplifier makes it from breadboard to PCB « Black Hat Security
May 22nd, 2011 on 8:24 AM[...] Laskowski's] been working on a Class-D audio amplifier for several months. What you see above is the most recent version of the amp. A class-D amplifier uses transistor switching (or in this case MOSFET switching) to generate the [...]
-
Electronics-Lab.com Blog » Blog Archive » Class D amplifier assembled
June 8th, 2011 on 2:47 PM[...] D amplifier assembled – [Link] Tags: Amplifier, Class D Filed in Audio | 1 views No Comments [...]
May 21st, 2011 on 6:56 PM
Very nice project! The 60Hz hum is annoying and need to be solved but it’s a very promising project, anyway.
May 22nd, 2011 on 8:47 AM
Hi,
How fast can your drivers+mosfet switch ? Can they handle a sigmadelta output at about 5MHz ?
Alvie
May 23rd, 2011 on 6:21 PM
Thanks for the comments!
@Vinicius: You are right, the 60Hz hum needs to be solved. I think the cause is the poor power supply I used to test. If I replaced it with a regulated laptop power brick, the hum should be gone.
@Alvie: I think 5MHz would be pushing it. 1MHz is probably more reasonable. The gate drivers have a 25ns rise/fall time. With their 2A source/sink capability and the MOSFETs 21nC gate charge, changing output states takes 21ns. One cycle is two of each of these time periods, or 92ns. So, if you didn’t give the output inductor time to charge at all, you could hit about 10MHz. To actually get an output, you’d want to clock it much lower than that.
August 24th, 2011 on 12:36 AM
link down
August 24th, 2011 on 9:15 AM
@vang: All the links seem to be up, try again?