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[aprssig] LM7805 and caps

Ben Jackson ben at ben.com
Sun Aug 26 20:40:36 UTC 2007


On Mon, Aug 27, 2007 at 06:36:50AM +1000, Andrew Rich wrote:
> 
> Do caps on an LM7805 player a larger role ? Is there something inside the
> reg that needs external C ?

The regulator is a feedback circuit.  The caps are required to stabilize
the operation.  LM7805 is more forgiving than most.  There are some
regulators which require very specific properties in the output capacitors
in order to be stable.  Almost every regulator datasheet devotes an entire
section to this topic.

-- 
Ben Jackson AD7GD
<ben at ben.com>
http://www.ben.com/




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