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[lcdproc] RE: Power - 7805 differences


Chronological Thread 
  • From: edwalter AT iname.com (Ervin Walter)
  • Subject: [lcdproc] RE: Power - 7805 differences
  • Date: Wed, 29 Apr 1998 10:41:38 -0500

>> Well, that's what I was thinking, too, but it was pointed out that it
>> isn't regulated, so you could end up frying the display. The two best
>> options I've seen were from Erv and Chris. Erv mentioned getting a
>> 78M05 chip and soldering it to the display. Chris talked about a 7805
>> chip to make a little regulator thingy I think.
>>
>> What I'm wondering is what is the difference between the two? Are these
>> actually two different chips? Which of the two would be
>> better/easier/cheaper/whatever? (or are they cheap enough that cost
>> isn't an issue?)
>
>I've just looked it up, and the difference between 7805 78L05 and 78M05
>is just the amount of current the devices can source.
>i.e. 'not very much', 100mA, 500mA respectively.
>
>The LCD display requires > 100mA to run, and so the 78M05 is required.
>
>Finally an answer!
>

So it is not the shape after all. I guess I miss understood what the tech
said about why the 78M05 was needed vs other 7805 regulators...



--
Ervin Walter
edwalter AT iname.com
Graduate Student
walter AT chem.wisc.edu
Department of Chemistry
edwalter AT students.wisc.edu
University of Wisconsin-Madison http://www.sit.wisc.edu/~edwalter




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