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regulator 7812 heat sink connection

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snazzy c

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is there any need of me using a heat sink for my 12v dc regulator powering 3 devices with 1500mA each. if.yes, i found it difficult getting them locally here. how will i connect them on the 7812 regulator. pls., if possible include a possible diagram for citations.
 

Yes, you'll need a heat sink, and two more regulators, and a cryogenic intercooler from NASA.:wink: The nominal current rating is 1A. https://www.onsemi.com/pub_link/Collateral/MC7800-D.PDF You're proposing to draw 4.5A from it. Even with 3 regulators and heat sinks, you're pushing the limit. You didn't say what input voltage you're using. That has a big effect as well.
 
input voltage is 12v dc. i really want to see the physical connection of the heat sink with the 7812 regulator.
 

You can't get 12V from 12V. Read the data sheet.
 

snazzy c said:
input voltage is 12v dc. i really want to see the physical connection of the heat sink with the 7812 regulator.
Click to expand...

Have a look at the attached pcture ..

And, btw, if the input voltage is 12Vdc and you want to supply 12V-devices - what do you need a regulator for?
Just connect 12Vdc to a 12V-device (1500mA) via a 2-3A slow-blow fuse and you're done ..

:wink:
 

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yes, i know i cant get 12v from 12v dc but i get 11v anyway. i didnt use any fuse though the 12v battery capacity is 40Ah. hope no danger!

---------- Post added at 05:53 ---------- Previous post was at 05:32 ----------

i want a schematic circuit diagram of converting or regulating a 24v dc battery to 19v dc supply with a device of 2A.
 

If you really want to achieve this goal of supplying a regulated 12V voltage out of 12V batter, where the voltage may drop under load to 11V, you have to consider the following scenario:
1.step the voltage up to, say, 13-15Vdc (regulated)
2.step the voltage down from 13-15V to 12V using low-dropout voltage regulators, eg LM2940 (one per each load) ..

IanP
:wink:

Your second question: it can be done using something like LM338 or LM350 ..
Google for the data sheets ..
 
i want a schematic circuit diagram of converting or regulating a 24v dc battery to 19v dc supply with a device of 2A
 

Linear: LM338, LM350 ..
Switching: LM2576-adj ..
Schematics are in the data scheets ..
 
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