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Old 30th June 2010, 12:48 PM   #1
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Default F2 and F5 heat question

Hello all and good morning!!!

I want to build either an F2 or F5 amp(s) for developing future pieces..

I have a few very wild designs, but want to know how much I can get away with with heat dissipation.. I strive for best practices, but want to know how far I can push the envelope..
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Old 30th June 2010, 02:05 PM   #2
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and question is ?
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Old 30th June 2010, 02:51 PM   #3
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How much heatsink is necessary... I'll post my drawing up later today to give an idea were my head is at..
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Old 30th June 2010, 03:02 PM   #4
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Well, there a few problems with your question.

First, the amount of heat sinking is, in part, determined by where you set the bias (the higher, the hotter). You may find diminishing rewards with further increases in bias. This is your call, since someone elses preference will be different then yours.

Second, the heat sinking can be more efficient (perhaps considerably more) if a fan is used. Use of a fan has its pros and cons.

Third, the amount of required heat sinking is discussed extensively in the F5 threads. The thread(s) is losing its usefulness because of the amount of off-topic discussion, but careful use of the search function can help.

Fourth, and this is most important, you need to read the F5 owner's manual. It has been posted and there is a clear description of the heat sinking requirements. No one is going to summarize it for you, you need to read it yourself.

Last edited by WithTarragon; 30th June 2010 at 03:16 PM.
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Old 30th June 2010, 07:57 PM   #5
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Go to Radio Shack and spend $30 on one of their cute little
infra-red temperature measurement thingies. It's great for
looking at transistors and heat sinks - set it for Centigrade.

When it shows your transistor case at 100 deg C, it's too hot.

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Old 30th June 2010, 08:18 PM   #6
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Quote:
Originally Posted by trusound View Post
How far I can push...were my head is at..
Need any clues ?
Attached Images
File Type: jpg HeadUpAssDriver-707597.jpg (105.6 KB, 282 views)
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Old 30th June 2010, 08:55 PM   #7
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Quote:
Originally Posted by Nelson Pass View Post
Go to Radio Shack and spend $30 on one of their cute little
infra-red temperature measurement thingies. It's great for
looking at transistors and heat sinks - set it for Centigrade.

When it shows your transistor case at 100 deg C, it's too hot.

what is radio shack?? nah, just kidding!
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Old 1st July 2010, 04:55 AM   #8
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Thanks everybody for all the responses.... even Jacco

here is a very crappy and rough drawing of what I want to create..

I call it the Sentinel

There will be 2 of these... both will stand about 3 feet tall, you'll be able to see the boards, power supplies etc, as they will be behind etched plexiglass.. The heatsink will be on the backside of the housing..

The majority of it will be painted along with exotic metal laminate inlays here and there..

Click the image to open in full size.
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Old 1st July 2010, 09:13 AM   #9
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Quote:
Originally Posted by trusound View Post
here is a very crappy and rough drawing of what I want to create..

I call it the Sentinel

The majority of it will be painted along with exotic metal laminate inlays here and there..

Click the image to open in full size.
Mmm Ambitious I like that!
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Old 1st July 2010, 09:50 AM   #10
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Quote:
Originally Posted by trusound View Post
2 of these
Easy peasy lemon squeezy....if you know how to sand cast, weld, and/or machine aluminum.
If not, then your Sentinel head will have to become quite large, your design indicates an underestimation of the heat sink requirement.
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