Minimum Internal Chassis Size For Audio Sector LM3875 Kit

CarlosT · 7th November 2006, 09:33 PM

Yes...I did search

I'm looking at some Hammond aluminum boxes for my mini-GC/powered mono speaker project. It's Hammond part # 1444-8 which is about 2" high. The biggest cap in the kit I think is 35 mm (Panasonic 1500uf 50V FC) but I'm concerned about this critical dimension.

A lot of GCs here are set up in airy and elegant HUGE boxes but I'm going a different route.

Can someone please measure their Audio Sector PSU and LM3875 cards and tell me the installed height including the thickness of the PCB?

Thanks so much!

pinkmouse · 7th November 2006, 09:56 PM

Here you can see a couple of the chipamp boards fitting nicely in a 1U rackmount case. That's 1 3/4" high.

Peter Daniel · 7th November 2006, 11:01 PM

Both amp and rectifiers boards are 1.2 x 2.9". Amp board with Panasonic 1500uF cap is 1.5" tall (including board material). Rectifiers board is 0.7" tall.

If you don't run the amp hard and don't use low impedance speakers, you don't need much heatsinking, the best example is this amp (1.75 x 4 x 6" in size): http://audiosector.com/chassis_patek2_amp.shtml

CarlosT · 8th November 2006, 02:01 AM

Thanks, guys. The cool thing is that I'm gonna stack the signal part of the amp in 4"x6"x2" aluminum box above an identical box which will hold the PSU...I may even line the power box with copper tape.

I'm approaching this GC LM3875 as art...

So Peter...your idea is that moderately driven LM3875s can be cooled acceptably by installing on a Hammond aluminum box?

Peter Daniel · 8th November 2006, 02:11 AM

Yes, the only instance those amps run hot is when the load is low (3 ohm or less) and the volume more than you really need.

7th November 2006, 09:33 PM	#1
CarlosT diyAudio Member Join Date: Oct 2006	Minimum Internal Chassis Size For Audio Sector LM3875 Kit Yes...I did search I'm looking at some Hammond aluminum boxes for my mini-GC/powered mono speaker project. It's Hammond part # 1444-8 which is about 2" high. The biggest cap in the kit I think is 35 mm (Panasonic 1500uf 50V FC) but I'm concerned about this critical dimension. A lot of GCs here are set up in airy and elegant HUGE boxes but I'm going a different route. Can someone please measure their Audio Sector PSU and LM3875 cards and tell me the installed height including the thickness of the PCB? Thanks so much!

7th November 2006, 09:56 PM	#2
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	Here you can see a couple of the chipamp boards fitting nicely in a 1U rackmount case. That's 1 3/4" high. __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort

7th November 2006, 11:01 PM	#3
Peter Daniel diyAudio Member Join Date: Jul 2002 Location: Toronto, Canada	Both amp and rectifiers boards are 1.2 x 2.9". Amp board with Panasonic 1500uF cap is 1.5" tall (including board material). Rectifiers board is 0.7" tall. If you don't run the amp hard and don't use low impedance speakers, you don't need much heatsinking, the best example is this amp (1.75 x 4 x 6" in size): http://audiosector.com/chassis_patek2_amp.shtml __________________ www.audiosector.com “Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC

8th November 2006, 02:11 AM	#5
Peter Daniel diyAudio Member Join Date: Jul 2002 Location: Toronto, Canada	Yes, the only instance those amps run hot is when the load is low (3 ohm or less) and the volume more than you really need. __________________ www.audiosector.com “Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC

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8th November 2006, 02:01 AM	#4
CarlosT diyAudio Member Join Date: Oct 2006	Thanks, guys. The cool thing is that I'm gonna stack the signal part of the amp in 4"x6"x2" aluminum box above an identical box which will hold the PSU...I may even line the power box with copper tape. I'm approaching this GC LM3875 as art... So Peter...your idea is that moderately driven LM3875s can be cooled acceptably by installing on a Hammond aluminum box?

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