Multiple Class-D amplifiers

Cyberzim · 27th April 2011, 07:46 PM

Hello DIY'ers!
Because I don't have time to try to make my own amplifer board I'm going to try out some from Connexelectronics.

I've choosen the following items:

TDA8950TH w. heatsink configured in BTL for a 8 ohm subwoofer.
Connexelectronic

TDA8920BTH w. heatsink in stereo for my middle/high tones.
Connexelectronic

500 Watt SMPS with +/- 31.5 Volt:
Connexelectronic

Will these two amplifiers work fine when working on the same supply? I think I've read something about that they could disturb each other because they might run on different frequencies.

Regards,

Simon H.A.

ghabrius · 28th April 2011, 07:10 AM

Hi,
Well it is highly recomended to run the modules at the same frequency and that is why they can be syncronized by an external oscillator..

Depending on the supply filtering in the amp boards you may get some extra distortion and noise in the sound.. I have used two TDA8924 modules with the same supply and didn't get a very clear difference so I guess you should be fine..

Cyberzim · 28th April 2011, 07:15 AM

I think I'll just give it a try

27th April 2011, 07:46 PM	#1
Cyberzim diyAudio Member Join Date: Apr 2009 Location: Gentofte	Multiple Class-D amplifiers Hello DIY'ers! Because I don't have time to try to make my own amplifer board I'm going to try out some from Connexelectronics. I've choosen the following items: TDA8950TH w. heatsink configured in BTL for a 8 ohm subwoofer. Connexelectronic TDA8920BTH w. heatsink in stereo for my middle/high tones. Connexelectronic 500 Watt SMPS with +/- 31.5 Volt: Connexelectronic Will these two amplifiers work fine when working on the same supply? I think I've read something about that they could disturb each other because they might run on different frequencies. Regards, Simon H.A.

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28th April 2011, 07:10 AM	#2
ghabrius diyAudio Member Join Date: Feb 2007 Location: Boston	Hi, Well it is highly recomended to run the modules at the same frequency and that is why they can be syncronized by an external oscillator.. Depending on the supply filtering in the amp boards you may get some extra distortion and noise in the sound.. I have used two TDA8924 modules with the same supply and didn't get a very clear difference so I guess you should be fine..

28th April 2011, 07:15 AM	#3
Cyberzim diyAudio Member Join Date: Apr 2009 Location: Gentofte	I think I'll just give it a try

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