[Diy_efi] A 2N2222A can handle up to 50mA

[Mike]

I've been using BC548 types I get for 0.04c each here in Oz,

rgds

mike



At 05:18 PM 2/17/03 -0800, you wrote:
>An even simpler and cheaper solution is one of the following:
>
>	MPSA27		(TO-92)
>	MPSA28		(TO-92)
>	NTE 46		(TO-92)
>
>Those are 500ma Darlingtons at about 14 cents a piece in bulk.  They have
>a gain of 10,000.  Base current is then unimportant.
>
>Digikey doesn't have any of the above in stock, but they do have the MPSA63,
>it's rated for max continuous collector current of 1.2A and has a gain
>between 5,000 and 10,000.  It's also 26 cents for 1, 19.8 for 25, and 13.73
>at 100.
>
>--Perry
>
>> 11 cents (in bulk) for a TO-92 2N2222A vs. ~$2.50 for a TO-220 FET output
>> driver.  Arrange it in a darlington if you want more base gain and stay
>> with the cheap stuff.  It's just a switch and either it's off or
>> saturated.  There's minimal heat from a saturated transistor -- aka
>> class-D.  It's running it linear where you need to concern yourself about
>> vce drop equaling heat dissipation (mostly).
>> --
>> David Gravereaux <davygrvy at pobox.com>
>
>-- 
>Perry Harrington			Data Acquisition & Instrumentation, Inc	
>perry at dainst dot com					 http://www.dainst.com/
>
>Those who would give up essential liberty to purchase a little temporary
safety
>deserve neither liberty or safety. Nor, are they likely to end up with
either.
>                             -- Benjamin Franklin
>
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