[aprssig] LM7805 and caps
mike.kc9doa at sbcglobal.net
Sun Aug 26 23:18:36 CDT 2007
Three terminal regulators can oscillate. It is good practice to
bypass the input and output with something that is effective at
On 27 Aug 2007 at 6:36, Andrew Rich wrote:
> Can someone explain to me why this is so:
> I have been building some projects now that use LM7805 voltage
> This is now the second time I have had issues with a PIC chip not
> It is only when I add caps to the input and the output that it
> settles down.
> Looking on the CRO, the DC looked noisy.
> I thought that the caps where there to trap AC.
> Do caps on an LM7805 player a larger role ? Is there something
> inside the reg that needs external C ?
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