19 Jan
2010
19 Jan
'10
1:13 a.m.
On 18 Jan 2010 at 17:40, Ben wrote:
But where do you get 3 amp heat sinks? All I ever see
are the wimpy
heat sinks.
Well, at Radio Shack, to start with:
http://www.radioshack.com/product/index.jsp?productId=2102857
But you could also just pull out your Aavid catalog and see what will
work. For TO-220, how about this one:
http://www.aavidthermalloy.com/cgi-bin/stdisp.pl?Pnum=568000b00000g
If you had to leave the resistor/7805 in, I'd add a fuse and
overvoltage crowbar across the output.
Alternatively, one could use one of the switching regulator ICs, such
as the Micrel MIC4576-5. Still a TO-220 package, but 5 leads and
70% efficiency requiring a couple of extra components.
--Chuck