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 Post subject: cooler? why?
PostPosted: 11.03.2003 18:51 
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Mini Modder
Mini Modder

Joined: 23.02.2003 18:41
Posts: 70
Location: Estonia
why do you need a cooler for that ? my modlab doesnt heat up at all.my 7805 doesnt get even slightly warm. :P

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PostPosted: 11.03.2003 19:42 
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Site Admin
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Joined: 24.01.2002 10:09
Posts: 4683
Location: Finland
It is all about current that flows through those components. If you are powering only a one led with the modlab, there will be only ~20mA flowing and it will not generate any heat but if you are going to power couple of fans etc. you will be taking an ampere or two and then those components are going to heat up. Heat sinks are there to make sure that the components can withstand those higher current peaks but like you said, they are not always needed.


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PostPosted: 12.04.2003 11:11 
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Mini Modder
Mini Modder

Joined: 23.02.2003 18:41
Posts: 70
Location: Estonia
I put a small motor in my regulated area, and the 7812 got slightly warm. But the BD442 got burning hot!! Is that normal, or is it my bad?

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PostPosted: 12.04.2003 11:21 
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Joined: 24.01.2002 10:09
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As you may have noticed, the BD442 also has that hole in its casing. It is used to mount heat sinks to sink the excess heat that it may be generating. That smaller heatsink in my modlab is hooked up with this BD442 and it keeps the components inside its operational specs. It will get hot if you don't have proper cooling for it.


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