[sdiy] Best way to get a +3.3V rail from +15V?

[ASSI]

On Thursday 07 March 2013, 19:38:12, Oscar Salas wrote:
> Looking now the LM317 datasheets from National and from Texas instruments,
> National Specifies the j-a thermal resistance 50C/W for the TO-220
> package and Texas Instruments specifies 29C/W. The same than specifies
> for the UA78M33.

Keep in mind these figures are for free convection and constant ambient 
temperature (i.e. infinity capacity for taking up heat).  In a (semi-)closed 
box the figures will be different, especially if the air inside does get 
warmer than 40°C (it will).  My personal rule of thumb: if something on the 
bench gets hotter than you can touch for a few seconds (about 60°C) then it 
needs cooling when put inside any enclosure.


Regards,
Achim.
-- 
+<[Q+ Matrix-12 WAVE#46+305 Neuron microQkb Andromeda XTk Blofeld]>+

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