Class D Audio Amplifiers - Page 6

Kjeldsen · 28th April 2010, 08:14 AM

Crap - my bad. I have used 1 or 2 metal screws and the rest i platic, because the holes I made was slightly inaccurate, and the platic screws could bend a little.

The high frequency noise on start up is present with a battery powered CD player, I guess the onlyu possible error would be my platic screws? I will test the modules, but I have extra on stock so no worries.

Btw. the amps sounds amazing compared to my panasonic SA-XR50 (analog input). It was really not fun at all to reinstall the panny after e few weeks with the TDA8950 modules.

bjorge · 5th May 2010, 09:46 PM

Hi !
I just received 2pcs TDA8920SMPS and 2pcs TDA892x Amp V2.
They ship with 7-pin connector cables - but I can't find any information on what pins are used for what ?

Regards, Bjorge

Cristi · 6th May 2010, 10:57 AM

Please check the pinout in the manual on the product page: Connexelectronic
here is the direct link to the amplifier manual: http://www.connexelectronic.com/docu...ier_Module.pdf

bjorge · 6th May 2010, 06:47 PM

I'm very sorry, the file is damaged when I try to open it !

dudaindc · 6th May 2010, 09:01 PM

Quote:

Originally Posted by bjorge

I'm very sorry, the file is damaged when I try to open it !

It works fine for me...

bjorge · 6th May 2010, 09:32 PM

Yeah, thanks ! I tried another pc, and I got to read them, too...;-)
Sorted out, then !

akilleuz · 12:15 PM

Hi,

Im going to mount my board to the chasis but i would like to clear something first:

1. Do i need to put metallic screws into ALL the mounting holes, into the heatsink?

2. Is it ok that the "chip" have direct connection to the heatsink, or do i need to put some of the plastic in between so the heat is transfered, but there is no electrical contact?

3. My heatsink i mounted in my computer, is it ok that the heatsink have "electrical contact" with the chasis, or do i need to "seperate it with e.g. plasic screws?

EDIT: its the 8950th chip

Best Regards

Thomas

akilleuz · 15th May 2010, 04:39 PM

I forgot to mention:

4. I have 2 modules on the same heatsink, do i need to seperate them to?

akilleuz · 15th May 2010, 04:52 PM

I forgot to mention that i have mounted both modules on the same heatsink, do i need to seperate them, so they cant see each other electricaly?

Kjeldsen · 08:09 PM

Metal screws in all holes are important, I've been told. Chip definately have to be isolated from the heatsink. Two boards either need two power supplies or share an external clock.

See also page 5 here

http://www.connexelectronic.com/docu...ier_Module.pdf

5th May 2010, 09:46 PM	#52
bjorge diyAudio Member Join Date: Jan 2004 Location: Asker	7-pin connector - how to connect ? Hi ! I just received 2pcs TDA8920SMPS and 2pcs TDA892x Amp V2. They ship with 7-pin connector cables - but I can't find any information on what pins are used for what ? Regards, Bjorge __________________ Regards, Bjørge

6th May 2010, 10:57 AM	#53
Cristi diyAudio Member Join Date: Dec 2008 Location: Shenzhen	Please check the pinout in the manual on the product page: Connexelectronic here is the direct link to the amplifier manual: http://www.connexelectronic.com/docu...ier_Module.pdf __________________ www.connexelectronic.com complete assembled amplifier and SMPS

6th May 2010, 06:47 PM	#54
bjorge diyAudio Member Join Date: Jan 2004 Location: Asker	I'm very sorry, the file is damaged when I try to open it ! __________________ Regards, Bjørge

6th May 2010, 09:32 PM	#56
bjorge diyAudio Member Join Date: Jan 2004 Location: Asker	Yeah, thanks ! I tried another pc, and I got to read them, too...;-) Sorted out, then ! __________________ Regards, Bjørge

15th May 2010, 12:06 PM	#57
akilleuz diyAudio Member Join Date: Aug 2004 Location: Frederici	Hi, Im going to mount my board to the chasis but i would like to clear something first: 1. Do i need to put metallic screws into ALL the mounting holes, into the heatsink? 2. Is it ok that the "chip" have direct connection to the heatsink, or do i need to put some of the plastic in between so the heat is transfered, but there is no electrical contact? 3. My heatsink i mounted in my computer, is it ok that the heatsink have "electrical contact" with the chasis, or do i need to "seperate it with e.g. plasic screws? EDIT: its the 8950th chip Best Regards Thomas Last edited by akilleuz; 15th May 2010 at 12:15 PM.

28th April 2010, 08:14 AM	#51
Kjeldsen diyAudio Member Join Date: Dec 2003 Location: Randers, Denmark	Crap - my bad. I have used 1 or 2 metal screws and the rest i platic, because the holes I made was slightly inaccurate, and the platic screws could bend a little. The high frequency noise on start up is present with a battery powered CD player, I guess the onlyu possible error would be my platic screws? I will test the modules, but I have extra on stock so no worries. Btw. the amps sounds amazing compared to my panasonic SA-XR50 (analog input). It was really not fun at all to reinstall the panny after e few weeks with the TDA8950 modules.

15th May 2010, 04:39 PM	#58
akilleuz diyAudio Member Join Date: Aug 2004 Location: Frederici	I forgot to mention: 4. I have 2 modules on the same heatsink, do i need to seperate them to?

15th May 2010, 04:52 PM	#59
akilleuz diyAudio Member Join Date: Aug 2004 Location: Frederici	I forgot to mention that i have mounted both modules on the same heatsink, do i need to seperate them, so they cant see each other electricaly?

16th May 2010, 07:59 PM	#60
Kjeldsen diyAudio Member Join Date: Dec 2003 Location: Randers, Denmark	Metal screws in all holes are important, I've been told. Chip definately have to be isolated from the heatsink. Two boards either need two power supplies or share an external clock. See also page 5 here http://www.connexelectronic.com/docu...ier_Module.pdf Last edited by Kjeldsen; 16th May 2010 at 08:09 PM.

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