November 9, 200817 yr 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: 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
November 9, 200817 yr Are you sure you want to push them any harder? I mean seriously, how much of a space heater are you trying to create?
November 10, 200817 yr 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.
November 12, 200817 yr Author 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
November 13, 200817 yr Which parts of the plastic virgin are teflon and which parts are natural? At least she'll be warm
November 13, 200817 yr Author Which parts of the plastic virgin are teflon and which parts are natural? At least she'll be warm as long as the black Delrin rod doesn't get involved.
November 13, 200817 yr Author so, does anyone need anything anodized black? I found a place to do it locally, but requires a minimum order of $100...
November 13, 200817 yr so, does anyone need anything anodized black? I found a place to do it locally, but requires a minimum order of $100... Oooh... could in the future, but not right now.
November 20, 200817 yr Author this is the general idea... the heat sinks totally dwarf that big Plitron
November 20, 200817 yr so, does anyone need anything anodized black? I found a place to do it locally, but requires a minimum order of $100...Yes.
November 20, 200817 yr No, I just want something -- possibly several somethings -- anodized black. It would probably be a bad idea to anodize your penis. Just thought you might like to know.
November 20, 200817 yr this is the general idea... the heat sinks totally dwarf that big Plitron Heatsinks look undersized to me.
November 20, 200817 yr Those are some manly heatsinks! Curious as to what type of topology you are using for this amp... I have a ton of these devices and no set design yet. If you still have a referral to onlinemetals I could definitely use one for an upcoming copper sheet purchase.
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