Sure 4*100w SMPS behaviour ..?

gainphile · 26th February 2011, 01:46 PM

I have been very happy with the 4*100watt kit. I built an 8-channel amp using two of these ready-made kit from eBay. At that time I use only 1 SMPS.

Class-D 8-channel amplifier build

In fact I am so happy with the quality that I decided to buy the second SMPS so that each board is powered separately.

Now... this is strange to me. When I had one SMPS only, the fan never turned on and it operaten cold/warm. Tonight I see the fan is on, and that the amp is running hot!

How is the explanation? I thought by adding more SMPS the amp would run cooler... no?

Eva · 26th February 2011, 05:26 PM

Check that the class D amplifier is getting the same supply voltage as with one SMPS.

killa12222 · 28th February 2011, 08:43 AM

Prior to installing the second psu, did you wire both amps in series?

My 4*100w is running on 24v and it does get hot to the point that i added a fan on the hs just to be on the safe side

gainphile · 28th February 2011, 09:40 AM

My multimeter is broken so I cant measure the voltage yet.

Yes before that I power both amp modules with 1 smps. The fan never turned on and never got that hot. Strange now that it does with 2 smps!

killa12222 · 28th February 2011, 10:33 AM

Yeah, it could be because each of your amps are running on 24v which has heaps more heat over 12v. Upside is that you get much more power output before audible distortion. Fans could/should be considered

Saw your build thread and it is verrry neat i must say!

sendler · 28th February 2011, 10:36 AM

Which fan is on? One of the SMPS?
.
.

Quote:

Originally Posted by gainphile

I have been very happy with the 4*100watt kit. I built an 8-channel amp using two of these ready-made kit from eBay. At that time I use only 1 SMPS.

Class-D 8-channel amplifier build

In fact I am so happy with the quality that I decided to buy the second SMPS so that each board is powered separately.

Now... this is strange to me. When I had one SMPS only, the fan never turned on and it operaten cold/warm. Tonight I see the fan is on, and that the amp is running hot!

How is the explanation? I thought by adding more SMPS the amp would run cooler... no?

killa12222 · 28th February 2011, 10:40 AM

Im guessing the SMPS because gainphile's 4*100w doesn't have a fan?

Hmm, the extra heat from both 4*100w's could be heating the SMPS's too?

gainphile · 1st March 2011, 06:49 AM

Helooooo more puzzling...

I played the amps at loud volume, and the amps are very COLD !!

It's only hot when I use it to play at low volume (as in at night).

yes I'm referring to the SMPS fan. The kit does not have fans.

So strange.

sendler · 1st March 2011, 11:01 AM

Quote:

Originally Posted by gainphile

Helooooo more puzzling...

I played the amps at loud volume, and the amps are very COLD !!

It's only hot when I use it to play at low volume (as in at night).

yes I'm referring to the SMPS fan. The kit does not have fans.

So strange.

Both fans or just the new supply? I have heard of some MeanWells malfunctioning out of the box. Maybe you got a bad one. Change the system back to a single power supply and see what happens with it now.

egberttheone · 1st March 2011, 02:33 PM

There are a lot of MeanWell clone's on ebay.
Buying a mean well of ebay is almost no go.
Maby there is a big ripple on the output of the supply you bought.

26th February 2011, 01:46 PM	#1
gainphile diyAudio Member Join Date: Dec 2007 Location: Melbourne the sunny city!	*Sure 4100w SMPS behaviour ..?** I have been very happy with the 4*100watt kit. I built an 8-channel amp using two of these ready-made kit from eBay. At that time I use only 1 SMPS. Class-D 8-channel amplifier build In fact I am so happy with the quality that I decided to buy the second SMPS so that each board is powered separately. Now... this is strange to me. When I had one SMPS only, the fan never turned on and it operaten cold/warm. Tonight I see the fan is on, and that the amp is running hot! How is the explanation? I thought by adding more SMPS the amp would run cooler... no? __________________ http://gainphile.blogspot.com

26th February 2011, 05:26 PM	#2
Eva diyAudio Member Join Date: Oct 2003 Location: Near the sea	Check that the class D amplifier is getting the same supply voltage as with one SMPS. __________________ I use to feel like the small child in The Emperor's New Clothes tale

28th February 2011, 09:40 AM	#4
gainphile diyAudio Member Join Date: Dec 2007 Location: Melbourne the sunny city!	My multimeter is broken so I cant measure the voltage yet. Yes before that I power both amp modules with 1 smps. The fan never turned on and never got that hot. Strange now that it does with 2 smps! __________________ http://gainphile.blogspot.com

1st March 2011, 06:49 AM	#8
gainphile diyAudio Member Join Date: Dec 2007 Location: Melbourne the sunny city!	Helooooo more puzzling... I played the amps at loud volume, and the amps are very COLD !! It's only hot when I use it to play at low volume (as in at night). yes I'm referring to the SMPS fan. The kit does not have fans. So strange. __________________ http://gainphile.blogspot.com

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28th February 2011, 08:43 AM	#3
killa12222 diyAudio Member Join Date: Jun 2010	Prior to installing the second psu, did you wire both amps in series? My 4*100w is running on 24v and it does get hot to the point that i added a fan on the hs just to be on the safe side

28th February 2011, 10:33 AM	#5
killa12222 diyAudio Member Join Date: Jun 2010	Yeah, it could be because each of your amps are running on 24v which has heaps more heat over 12v. Upside is that you get much more power output before audible distortion. Fans could/should be considered Saw your build thread and it is verrry neat i must say!

28th February 2011, 10:40 AM	#7
killa12222 diyAudio Member Join Date: Jun 2010	Im guessing the SMPS because gainphile's 4100w doesn't have a fan? Hmm, the extra heat from both 4100w's could be heating the SMPS's too?

1st March 2011, 02:33 PM	#10
egberttheone diyAudio Member Join Date: Nov 2006	There are a lot of MeanWell clone's on ebay. Buying a mean well of ebay is almost no go. Maby there is a big ripple on the output of the supply you bought.

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