Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Class D Switching Power Amplifiers and Power D/A conversion

PWM Class D amplifier
PWM Class D amplifier
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 24th August 2013, 07:05 PM   #1
vicelord is offline vicelord  Romania
diyAudio Member
Join Date: Jul 2006
Default PWM Class D amplifier

Hello i'm a student at Electronics Engineering in Bucharest Romania and need to build a class D amplifier that uses pulse width modulation ( PWM ) i searched the forums but couldn't find anything.
The amplifier should be about 50w in to 8ohms.
Can you recomand me a schematic??

  Reply With Quote
Old 26th August 2013, 09:27 PM   #2
vicelord is offline vicelord  Romania
diyAudio Member
Join Date: Jul 2006
What do you think about this circuit???
Will it work in real life???
  Reply With Quote
Old 26th August 2013, 10:00 PM   #3
JonSnell Electronic is offline JonSnell Electronic  United Kingdom
diyAudio Member
JonSnell Electronic's Avatar
Join Date: Dec 2012
Location: The Jurassic Coast, England. GB
I would cheat and look at the IR range of class D amplifiers. If you need to come up with a novel design. Select a square wave oscillator at more than audio frequency. Feed it into an integrator to produce a triangle waveform. Feed that into the -ve input of a TK071 and your audio into the +ve input. The result is PWM. Feed a pair of FETs and there you are.
No distortion and plenty of power. Distortion is related to the shape of the waveform.
Your power supply will work the amp nicely.
Support for Fender, Marshall and all Valve Equipment; Audio Innovations, Audiorama FU29, Quad and Leak. www.jonsnell.co.uk
  Reply With Quote
Old 27th August 2013, 01:10 AM   #4
nigelwright7557 is offline nigelwright7557  United Kingdom
diyAudio Member
nigelwright7557's Avatar
Join Date: Apr 2008
Location: Carlisle, England
You should be able to build a reasonable pwm circuit.
However people often have trouble with them.
Overdriving them will see long pulses of DC going to the speaker.
There is often problems with hum on none feedback pwm amps.
You will also need something to level shift from the pwm to the output mosfets.
I think I used an ir2113 for that.
Murton-Pike Systems PCBCAD51 pcb design software. http://www.murtonpikesystems.co.uk
  Reply With Quote


PWM Class D amplifierHide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
My very first Class D pwm (switching) amplifier. Circlotron Class D 595 25th December 2014 04:19 PM
Class-G amplifier with PWM supply ! B.I.G Chip Amps 2 19th March 2005 07:32 AM

New To Site? Need Help?

All times are GMT. The time now is 08:12 AM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio