Go Back   Home > Forums > Amplifiers > Class D

Class D Switching Power Amplifiers and Power D/A conversion

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
Reply
 
Thread Tools Search this Thread
Old 16th June 2012, 03:28 PM   #11
diyAudio Member
 
danielwritesbac's Avatar
 
Join Date: Nov 2007
Quote:
Originally Posted by nigelwright7557 View Post
. . . There are loads of irs2092 based pcbs on ebay.
I've noticed the bad quality 40Mhz Hi-Sincerity 2SD669AC second source fake hitachi device installed on the heatsinks of most ebay IRS2092 based boards. The Sure IRS2092 doesn't use the fake transistor. In the photograph of the Sure is a Toshiba specific 220 casing, such as used for 2SC5171. Can someone tell me what transistor they used?
__________________
Tools, Models & Software for DIYClipNipper boostLM1875 TurboPowerful TDA7293 kitTDA7294 pt2pt ♦ My post has opinion.
  Reply With Quote
Old 20th June 2012, 09:45 PM   #12
exflaco is offline exflaco  Armenia
diyAudio Member
 
Join Date: Mar 2005
Location: Santa Fe
Daniel, the 669 only for 12v aux dc Ljm l15d l20d l25d no problen with 669
  Reply With Quote
Old 23rd December 2012, 10:44 PM   #13
diyAudio Member
 
Join Date: Oct 2012
Thumbs up 4-way Active Speaker with IR 2092 Amp

I put together 2 IR 2092 amp board with a mini-dsp. Used a toroid AC 35-0-35 500VA power supply to get +/- 54V DC. Unit works and sound incredible. I will never need to drive this even to 20% of the rated power.
Attached Images
File Type: jpg IMG_0669-2.jpg (283.9 KB, 446 views)
  Reply With Quote
Old 31st March 2014, 09:55 PM   #14
rfj5106 is offline rfj5106  United States
diyAudio Member
 
Join Date: Mar 2006
Location: Richmond, B.C CANADA
Default Exasperating Ampifier

I have built a power amplifier incorporating the ‘Sure AA-AB32291 Ver.1.0’ amplifier module and it has been totally exasperating to say the least. A picture is posted. I used a 600 watt 40-0-40vac transformer with a 6 X 10K uF capacitors for +56-0-(-56) vdc. There is 0-12vac tap on the transformer that feeds 12vdc power regulator. The 12vdc is used to power the power indicator light and the LED VU meters. The VU meters monitor only the input signal. After he VU meters, the input signal is attenuated by a 50K potentiometer and then the input signal enters the module.

When you power this amplifier on, typically channel ‘b’ is dead, channel ‘a’ is working. Channel ‘a’ if the attenuator is wide open, there is a high pitched whine along with the music. If the attenuator is rolled back 25% (audio taper), the whine very abruptly disappears. If you leave attenuator on channel ‘b’ open and raise the volume on the preamp, at a certain point, channel ‘b’ comes to life very suddenly. There is no high pitched whine as there is channel ‘a’. The other annoying aspect of this amplifier is that it seems to run on the edge of thermal shut down. If the room gets warm, the amp will shut down. So it looks like a small internal fan is advised. But before I buy the fan, can anybody tell me how to: (1) Get rid of the high pitched whine. (2) Get channel ‘b’ working without blowing up the speaker.

When this module is working, the sound is quite acceptable.

Click the image to open in full size.
__________________
Richard Jenkins
  Reply With Quote
Old 31st March 2014, 10:00 PM   #15
rfj5106 is offline rfj5106  United States
diyAudio Member
 
Join Date: Mar 2006
Location: Richmond, B.C CANADA
You can see a picture of this amp at:

https://docs.google.com/file/d/0B29I...5yT1dyRG8/edit
__________________
Richard Jenkins
  Reply With Quote
Old 31st March 2014, 10:10 PM   #16
diyAudio Member
 
nigelwright7557's Avatar
 
Join Date: Apr 2008
Location: Carlisle, England
Reminds me of the heartache I had when I first started with irs2092 based designs.

I had a whine and it turned out to be noise on the VCC. My regulator wasn't decoupled enough.

I also found I had problems with turn on/off pops thumps and siren type sounds.
IR said I had too much smoothing capacitors. So I put together a small PIC based circuit that holds the 2092 in reset when the VCC drops below 12 volts.

The 2092 is very fussy about pcb layout and decoupling.
The 2092 and the mosfets need very close decoupling.

I also had to fiddle with the over current setting resistors to stop resetting on high volumes.

I wanted to get to high powers so I used irfb4227's with gate driver transistor buffers.
The 2092 driver output is quite weak and just about manages to cope with a pair of irfb4019's.
__________________
http://www.murtonpikesystems.co.uk PCBCAD50 pcb design software.

Last edited by nigelwright7557; 31st March 2014 at 10:12 PM.
  Reply With Quote
Old 3rd April 2014, 10:47 PM   #17
Jsixis is offline Jsixis  United States
diyAudio Member
 
Join Date: Feb 2011
Location: Columbus Ohio
Quote:
Originally Posted by redjr View Post
I just purchased this same amp module (Sure IRS2092). I intend to power it so that I get the maximum output of 100wpc into 8 ohms. My question is; Can I build a simple, well filtered linear PSU that will supply ~56VDC/rail to power this thing? Or, do Class D amps need to use a SMPS?
yes you can use a linear supply, it may sound better.
__________________
I know nothing, so learning is really awesome.
  Reply With Quote
Old 4th April 2014, 01:01 AM   #18
rfj5106 is offline rfj5106  United States
diyAudio Member
 
Join Date: Mar 2006
Location: Richmond, B.C CANADA
While the spec sheet says 56 volts, I am not sure as my amp has a 56 volt (40vac-0-40vac transformer) supply and one channel does not want to start unless the preamp is turned way up, then it kicks in. Weird. I suspect the 56 volts is not enough to get the module started.
__________________
Richard Jenkins
  Reply With Quote
Old 4th April 2014, 01:10 AM   #19
arlis is offline arlis  United States
diyAudio Member
 
Join Date: Dec 2013
I have one that's getting 60.3 volts and it works just fine.
  Reply With Quote

Reply


Hide 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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
MY DESIGN L20D IRS2092+IRFI4020H 200W8R ljm_ljm Class D 847 Today 02:59 AM
Need part # for 30-pin connector part inside Logitech Transporter on front panel PCB Bellatone Digital Source 4 27th April 2011 07:39 PM
Heathkit AA-40 or AA-121 panheadchopper Tubes / Valves 1 5th February 2011 03:51 AM
FS: HIGH END Home Audio lot..Opera Louspeakers, Triangle Comete, AA Primo, AA, etc. JiggaD369 Swap Meet 6 22nd August 2008 01:32 AM
what part can take the place of ST part VB408B completely peterchen88 Parts 0 8th September 2007 05:45 AM


New To Site? Need Help?

All times are GMT. The time now is 03:47 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2