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11-08-2008, 09:59 PM
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Big Solid State Amps
So, I'm working on a pair of monoblocks. swt61 has seen these monster heat sinks. 12.2" wide x 12" tall with 2.925" fins and 0.326" base, weight is 13 pounds... and I got four. I've done some thermal plots of 6 devices per heatsink on a small PCB. Each device is dissipating 14.8W x 6 devices x 4 channels ~ 350W. I'm wondering how much further I can push the devices. The sim data is very close to actual temperatures and since I don't want to drill holes under the devices for thermal probes, the simulator will be gospel. I don't really want to move the devices apart anymore, as I have a PCB in mind I'd like to accommodate, plus a design of my own.
Datasheets for devices: http://www.fairchildsemi.com/ds/FQ%2FFQA12P20.pdf http://www.fairchildsemi.com/ds/FQ%2FFQA19N20C.pdf Attached are some plots and below is the tabular sim data: Code:
Thermal Design Details Heatsink type: Extrusion Part number: Extrusion: 9012 Weight: 5.26685 kg Heatsink dimensions: 309.96 mm wide x 304.8 mm long x 74.3 mm high Material: Aluminum Finish: B Environment Ambient Temperature: 25.0 C Altitude: 0.0 m Thermal Design Details Temperature Source Names %sc Power Tsink-avg Tsink-max Tcase Tjunction C C C C N2 0.3% 14.8 W 49.5 49.6 49.6 77.9 N1 0.3% 14.8 W 48.6 48.9 48.9 74.4 N3 0.3% 14.8 W 49.1 49.3 49.3 75.5 P2 0.3% 14.8 W 49.5 49.6 49.6 75.9 P1 0.3% 14.8 W 48.6 48.9 48.9 72.3 P3 0.3% 14.8 W 49.1 49.2 49.2 75.5 
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11-08-2008, 10:32 PM
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Re: Big Solid State Amps
Sweet I'm sure this will be awesome.
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11-09-2008, 12:17 AM
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Re: Big Solid State Amps
Are you sure you want to push them any harder? I mean seriously, how much of a space heater are you trying to create?
__________________
Home Rig: CD73 or SB3 -> Hertsens DAC -> The Menace -> HD650's or Ian Modded HF-1 #8 Soldering Rig: Macbook -> Duet -> SimpleSE -> Ascend Acoustics CBM-170 Certified DIY Junkie -Specializing in cutting round holes in metal plates since 2004... First Law of Physics: A spatula will not fly a straight trajectory if hurled by an angry oral hygienist. 
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11-10-2008, 06:57 PM
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Re: Big Solid State Amps
I'll be making solid wood face panels for these big boys.
Maple with Pink Ivory heart shaped inlays. Marc did you want little Purple Heart daisy inlays as well? No extra charge. 
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11-12-2008, 01:03 PM
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Re: Big Solid State Amps
just bought some metal online. If anyone needs to buy from onlinemetals.com, let me know and I can send you a discount coupon as part of their refer a friend. It's an additional 5% off, which is added to their 5% discount for signing up and the 10% discount for material orders over $100.
Anyways, here's what I got: Aluminum 6061-T6 Bare Extruded Square 0.375" Cut to: 11.8425" 8 @ $1.66 Aluminum 3003-H14 Perforated Sheet Round Hole 0.125" Thick (0.5" dia. holes) 0.6875" stagger Cut to: 12.0457" x 5" 4 @ $10.84 Aluminum 6061-T6 Bare Extruded Rectangle 0.375" x 2" Cut to: 4.25" 4 @ $2.55 Plastic Teflon Virgin NATURAL Extruded Round 0.8125" Cut to: 12" 1 @ $9.03 Plastic Acetal Black Round 1.375" Cut to: 12" 1 @ $9.29
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11-12-2008, 01:08 PM
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Re: Big Solid State Amps
oh, and before you ask what the last two items are for....
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11-12-2008, 08:16 PM
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Re: Big Solid State Amps
Which parts of the plastic virgin are teflon and which parts are natural?
At least she'll be warm 
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11-12-2008, 08:51 PM
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Re: Big Solid State Amps
Quote:
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11-13-2008, 09:52 AM
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Re: Big Solid State Amps
cuckold jokes hit too close to home for aerius.
__________________
 tooleaudio denon 2900/apogee duet->tooleaudio balanced mosfet preamp->zebrawood grado hf1 Denon DA-500/Marantz 6300->Hagerman Bugle->Luxman LV113>zebrawood grado hf1 "But then the song sounded really great, so I had to use it, didn't I?" - Christopher Guest Big game is waiting there inside her tights, yeah
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11-13-2008, 01:41 PM
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Re: Big Solid State Amps
so, does anyone need anything anodized black? I found a place to do it locally, but requires a minimum order of $100...
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11-13-2008, 03:25 PM
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Re: Big Solid State Amps
Quote:
__________________
Rotel RCD-855 | Counterpoint SA5.1 | Odyssey Stratos | Von Schweikert VR4GII Rotel RCD-855 | Gilmore | K601 / K271S / SR-60 
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11-19-2008, 11:50 PM
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Re: Big Solid State Amps
this is the general idea... the heat sinks totally dwarf that big Plitron
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11-20-2008, 12:17 AM
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Re: Big Solid State Amps
Quote:
__________________
Dirty Laundry Will Out. In Russia, Fascism embraces you. /)_/) I remain,(^.^=) (")"_)o :-Peter, aka :-Dusty :-(halk
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11-20-2008, 12:55 AM
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Re: Big Solid State Amps
Quote:
__________________
Can Jam in LA - coming soon It's not arms or legs
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