Minimum Internal Chassis Size For Audio Sector LM3875 Kit - diyAudio
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Old 7th November 2006, 09:33 PM   #1
CarlosT is offline CarlosT  United States
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Default 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!
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Old 7th November 2006, 09:56 PM   #2
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Here you can see a couple of the chipamp boards fitting nicely in a 1U rackmount case. That's 1 3/4" high.
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Old 7th November 2006, 11:01 PM   #3
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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
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Old 8th November 2006, 02:01 AM   #4
CarlosT is offline CarlosT  United States
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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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Old 8th November 2006, 02:11 AM   #5
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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.
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Old 6th December 2013, 07:45 PM   #6
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you can find some cheap aluminum boxes on amazon, just search aluminum chassis.
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