F3 Heatsink

vdi_nenna · 02:01 AM

Hello Everyone,

I want to build a F3 (aka Zen 9) and have a set of 4 heatsinks that might work, but not sure if they big enough. I think they are cutting it close. F3 dissipates 100w per channel. That's a tall order. Intended to use 1 heatsink for the 2 mosfets and another for the power jfet and mosfet. Here's the dimensions of one heatsink.

Back plate: 10-3/4" x 4-9/16' x 1/4'

Fins: 18 per HS 1-3/8 x 4-5/8 x 3/32, Not including height of back plate

Overall Dimensions: 10-3/4 x 4-9/16 x 1-5/8

Let me know what you think!

Thanks,

Vince

vdi_nenna · 9th July 2011, 02:03 AM

Couple of pics.

Bksabath · 9th July 2011, 02:59 AM

As you already have the sink why not rig up the mosfets as if you where matching the VGS run them at the suply voltagge and bias to suit
EG 25 V 2 A = 50 Watt an see how hot they get
It is difficoult to say from pictures
Base plate only 8 mm? fins 40? + they would run cooler if anodised black.

digits · 9th July 2011, 04:52 AM

My estimate with 100W through that is 50C above ambient....

Nelson Pass · 9th July 2011, 07:32 PM

2 per ch, they should be fine.

vdi_nenna · 11th July 2011, 02:20 AM

I was going to build the F3 with heat sinks only on the bench; without a case. This way, if these are not big enough, I'll just fine other HS to use.

Funny thing happened a couple of weeks ago. Had a home energy audit. Auditor had FLIR with him. The F5 and Mini A amps were warming up when they got there.
Both amps read 103 - 110 degrees F. Good to know.

Thanks for the help,

Vince

Lazybutt · 12th July 2011, 01:26 PM

haha reminds me I bought an IR "ear" Thermometer for my daughter... out of curiosity I pointed it to my DACs shunt regs heatsinks.. the thing seems to work quite accurately since it showed ~65C and I just (barely) cannot put my hand for 3 secs. (After that I probed all sorts of things in the house to check and I was amazed at the range of temps it measured

Nice IR Temp probe for 15$ !

9th July 2011, 01:42 AM	#1
vdi_nenna diyAudio Member Join Date: Oct 2000 Location: PA, USA	F3 Heatsink Hello Everyone, I want to build a F3 (aka Zen 9) and have a set of 4 heatsinks that might work, but not sure if they big enough. I think they are cutting it close. F3 dissipates 100w per channel. That's a tall order. Intended to use 1 heatsink for the 2 mosfets and another for the power jfet and mosfet. Here's the dimensions of one heatsink. Back plate: 10-3/4" x 4-9/16' x 1/4' Fins: 18 per HS 1-3/8 x 4-5/8 x 3/32, Not including height of back plate Overall Dimensions: 10-3/4 x 4-9/16 x 1-5/8 Let me know what you think! Thanks, Vince __________________ I build, therefore I am. Last edited by vdi_nenna; 9th July 2011 at 02:01 AM.

11th July 2011, 02:20 AM	#6
vdi_nenna diyAudio Member Join Date: Oct 2000 Location: PA, USA	I was going to build the F3 with heat sinks only on the bench; without a case. This way, if these are not big enough, I'll just fine other HS to use. Funny thing happened a couple of weeks ago. Had a home energy audit. Auditor had FLIR with him. The F5 and Mini A amps were warming up when they got there. Both amps read 103 - 110 degrees F. Good to know. Thanks for the help, Vince __________________ I build, therefore I am.

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9th July 2011, 02:59 AM	#3
Bksabath diyAudio Member Join Date: Dec 2007	As you already have the sink why not rig up the mosfets as if you where matching the VGS run them at the suply voltagge and bias to suit EG 25 V 2 A = 50 Watt an see how hot they get It is difficoult to say from pictures Base plate only 8 mm? fins 40? + they would run cooler if anodised black.

9th July 2011, 04:52 AM	#4
digits diyAudio Member Join Date: Apr 2011	My estimate with 100W through that is 50C above ambient....

9th July 2011, 07:32 PM	#5
Nelson Pass The one and only Join Date: Mar 2001	2 per ch, they should be fine.

12th July 2011, 01:26 PM	#7
Lazybutt diyAudio Member Join Date: Mar 2009	haha reminds me I bought an IR "ear" Thermometer for my daughter... out of curiosity I pointed it to my DACs shunt regs heatsinks.. the thing seems to work quite accurately since it showed ~65C and I just (barely) cannot put my hand for 3 secs. (After that I probed all sorts of things in the house to check and I was amazed at the range of temps it measured Nice IR Temp probe for 15$ !

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