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

Sweet I'm sure this will be awesome.

Are you sure you want to push them any harder? I mean seriously, how much of a space heater are you trying to create?

These will be TWAs. Texas Winter 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.

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

oh, and before you ask what the last two items are for....

Plastic Teflon Virgin NATURAL

1 @ $9.03

You dog.

Building your own sex toy belongs on another forum!

Building your own sex toy belongs on another forum!

Aerius' forum.

Which parts of the plastic virgin are teflon and which parts are natural?

At least she'll be warm

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.

Cue Aerius, cue Aerius.

cuckold jokes hit too close to home for aerius.

so, does anyone need anything anodized black? I found a place to do it locally, but requires a minimum order of $100...

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.

this is the general idea... the heat sinks totally dwarf that big Plitron

Ah yes, the ghetto Halcro look. Very nice!

so, does anyone need anything anodized black? I found a place to do it locally, but requires a minimum order of $100...

Yes.

Yes.

So you're the one that bought the chrome plated PS-1s.

No, I just want something -- possibly several somethings -- anodized black.

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.

this is the general idea... the heat sinks totally dwarf that big Plitron

Heatsinks look undersized to me.

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.

Heatsinks look undersized to me.

Yeah and John Holmes had a small pee pee.