Go Back   Home > Forums > >

Test class d dwm drive board separately
Test class d dwm drive board separately
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
Old 20th November 2020, 07:20 PM   #1
Achim1409 is offline Achim1409  Germany
diyAudio Member
 
Join Date: Mar 2018
Location: Germany
Default Test class d dwm drive board separately

I want to test a audio drive board outside the amp, with a self build power supply. Is it enough to provide +-5v, +15v and +12v to engage the irs 21844s?
__________________
2Ch. DSO, Multimeter, Hot Air Station, Soldering Irons,
12V Server Supply, L-C-R Tester, Component tester
  Reply With Quote
Old 20th November 2020, 09:34 PM   #2
Perry Babin is offline Perry Babin  United States
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
What tests are you going to try to perform?
__________________
Anyone who purchased the repair tutorial, email me (babin_perry@yahoo.com) if you want to download the latest version.
  Reply With Quote
Old 20th November 2020, 09:36 PM   #3
Achim1409 is offline Achim1409  Germany
diyAudio Member
 
Join Date: Mar 2018
Location: Germany
Oly output signal and oscillation
__________________
2Ch. DSO, Multimeter, Hot Air Station, Soldering Irons,
12V Server Supply, L-C-R Tester, Component tester
  Reply With Quote
Old 20th November 2020, 09:39 PM   #4
Perry Babin is offline Perry Babin  United States
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
You'll have to supply the high-side B+.

Are you referring to the oscillation that's produced by the drive signal (that you'll have to supply) or do you expect it to oscillate at near 100kHz like it does when the amp is functioning?

Are you going to load the outputs to simulate the FETs being in the circuit?

Are you going to try to get it to vary the pulse width?
__________________
Anyone who purchased the repair tutorial, email me (babin_perry@yahoo.com) if you want to download the latest version.
  Reply With Quote
Old 20th November 2020, 09:46 PM   #5
Achim1409 is offline Achim1409  Germany
diyAudio Member
 
Join Date: Mar 2018
Location: Germany
No, only test oscillation. Outside of the amp without any other components.
__________________
2Ch. DSO, Multimeter, Hot Air Station, Soldering Irons,
12V Server Supply, L-C-R Tester, Component tester
  Reply With Quote
Old 20th November 2020, 09:48 PM   #6
Achim1409 is offline Achim1409  Germany
diyAudio Member
 
Join Date: Mar 2018
Location: Germany
It's like a testbed only for that cards.
__________________
2Ch. DSO, Multimeter, Hot Air Station, Soldering Irons,
12V Server Supply, L-C-R Tester, Component tester
  Reply With Quote
Old 20th November 2020, 09:49 PM   #7
Perry Babin is offline Perry Babin  United States
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
High-side B+ and a drive signal may be all you need. Try it.
__________________
Anyone who purchased the repair tutorial, email me (babin_perry@yahoo.com) if you want to download the latest version.
  Reply With Quote
Old 21st November 2020, 10:52 AM   #8
MarioRestucci is offline MarioRestucci  Italy
diyAudio Member
 
MarioRestucci's Avatar
 
Join Date: Aug 2012
Location: NAPOLI
I did it! I made a test bench on a bread board, with a linear (toroidal) power supply generating +/- 30v rails (of which only the negative rail is used). Through a separate winding it is possible to generate the auxiliary voltages of +/- 5v (the voltage of 15v is not needed, because it is used only for the lm293 which carries out the protections) and through a second separate winding with reference to the negative rail, I obtained about 20 volts which I stabilized at 12volt with a regulated lm7812 to power the low side of the ICs. To power the high side, simply connect VS with the negative rail and magically you will also have modulation on the high side. I also thought about building a circuit (using professional services) made specifically to test these boards, but I find it too stressful, because every time I have to test the driver cards externally, I just have to prepare my bread board for the need ( it only takes 10 minutes).

Personally I think that all these tests can also be done with the driver board mounted on the amplifier (without the mosfets) but hey, you're right, because the amplifier runs very high voltages which in case of problems can damage the board. Also on the amplifier, generating the power for the high side, could trigger unwanted protections. Most importantly, if you take apart a driver card to repair it, right after you do, you'll want to try it out, so better try it out before you mount it on the amplifier.
__________________
Two things save us in life: love and laugh. If you have one, that's fine. If you have both, you are invincible.
  Reply With Quote
Old 21st November 2020, 12:44 PM   #9
Achim1409 is offline Achim1409  Germany
diyAudio Member
 
Join Date: Mar 2018
Location: Germany
Hello, thank you for the Information. I have a laboratory power supply, which makes up to 30VDC. So i need only the Voltage regulators. I like to test the boards outside the amp, because i dont like to test with 200V and more. I think it makes it more easy. Ok, i will start to build now.. I will report when iam finished.
__________________
2Ch. DSO, Multimeter, Hot Air Station, Soldering Irons,
12V Server Supply, L-C-R Tester, Component tester
  Reply With Quote
Old 21st November 2020, 03:31 PM   #10
Achim1409 is offline Achim1409  Germany
diyAudio Member
 
Join Date: Mar 2018
Location: Germany
Finished... Now I will test a drive board
Attached Images
File Type: jpg IMG_20201121_163035.jpg (400.1 KB, 75 views)
__________________
2Ch. DSO, Multimeter, Hot Air Station, Soldering Irons,
12V Server Supply, L-C-R Tester, Component tester
  Reply With Quote

Reply


Test class d dwm drive board separatelyHide this!Advertise here!
Thread Tools

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
How to use a dual opamp separately as two single opamp Sunsun22 Parts 14 21st May 2016 04:08 PM
DWM 3640 Driver Board bl4ckw1d0w Car Audio 26 18th May 2016 10:02 AM
bypassing DIN-9pin on a Sanyo DWM-3500 noob help camcam089 Everything Else 1 12th January 2015 08:38 AM
DWM 3640 CL2 CL3 bl4ckw1d0w Car Audio 2 3rd June 2014 12:09 AM
Double woofer design - measure together or separately? btntx Multi-Way 3 7th November 2013 12:51 AM


New To Site? Need Help?

All times are GMT. The time now is 06:01 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Copyright ©1999-2021 diyAudio
Wiki