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 17th April 2013, 04:17 AM #21 diyAudio Member   Join Date: Oct 2003 For your reference, free download : http://www.linearaudio.net/images/st...%20PK%20lr.pdf F5X -- the EUVL Approach Patrick __________________ xen-audio.com
 17th April 2013, 05:40 PM #22 diyAudio Member   Join Date: Feb 2009 That was very helpful, Papa. Thanks! I like your other rule of thumb also: you should be able to keep your fingers on the heatsink for 10 seconds.
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Join Date: Mar 2006
Location: highlands
Quote:
 Originally Posted by albertNL I am sorry, but it is late and I am lost. Tj = W * (Rj + Rc + Rh) + Ta Tj = 16 * (1 + 1 + 2) + 25 Tj = 16 * 4 + 25 Tj = 64 + 25 Tj = 89 Where did 116 come from?
I know this is an old thread but i also find this confusing.
Maybe someone could explain a little further.

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Join Date: Jul 2004
Location: Italy
Quote:
 Originally Posted by el_mariachi I know this is an old thread but i also find this confusing. Maybe someone could explain a little further.
You can model the thermal circuit as an electrical circuit [Thermal unit = Electrical unit]:

Thermal resistance (Rth) = R
Power (W)= I
Temperature (T)= V

From Ohm's law

V = I * R
T = W * Rth

https://en.wikipedia.org/wiki/Thermal_resistance

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Join Date: Sep 2013
Blog Entries: 2
Quote:
 Originally Posted by el_mariachi I know this is an old thread but i also find this confusing. Maybe someone could explain a little further.
Most likely a simple mistake
__________________
"If you leave this point unattached to some circuitry, an ideal constant current source will emit a small lightning bolt which will travel until it connects to something." Nelson Pass

 23rd April 2016, 05:14 PM #26 The one and only     Join Date: Mar 2001 Yes, should have been +25, and old calculator. (me)
 23rd April 2016, 06:56 PM #27 diyAudio Member     Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain yup but even with + instead of - , it can't be 116 however , what's small typo between friends ....... logic is what counts __________________ my Papa is smarter than your Nelson ! clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa...© by Mighty ZM
 23rd April 2016, 07:01 PM #28 diyAudio Member     Join Date: Nov 2003 Location: Budapest Papa just put to the test us. __________________ Those who would have deserved the life they are all dead already. "Oh, my dead dears!" - Captain Cat
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Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
even if flawless - when making amps ,he's deadly serious ..... in same amount as Kung Fu Panda

however , when numbers and words are in case , ya better read between the lines
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__________________
my Papa is smarter than your Nelson !
clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa...© by Mighty ZM

Last edited by Zen Mod; 23rd April 2016 at 07:15 PM.

 23rd April 2016, 07:18 PM #30 diyAudio Member     Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain I found Da Logic : Tj = W * (Rj + Rc + Rh) + Ta Tj = 16 * (1 + 1 + 2) + 25 Tj = 16 * 4 + 25 Tj = 64 + 25 Tj = 89 now , just add 42 so Tj= 89+42 Tj= 116 __________________ my Papa is smarter than your Nelson ! clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa...© by Mighty ZM

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