[OZAPRS] LM7805 and caps

Andrew Rich vk4tec at people.net.au
Mon Aug 27 06:36:50 EST 2007

Can someone explain to me why this is so:

I have been building some projects now that use LM7805 voltage regulators.

This is now the second time I have had issues with a PIC chip not running.

It is only when I add caps to the input and the output that it settles

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 ?


Andrew Rich VK4TEC
vk4tec at people.net.au

No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.5.484 / Virus Database: 269.12.8/973 - Release Date: 25/08/2007
5:00 PM
Ozaprs mailing list
Ozaprs at aprs.net.au

More information about the Ozaprs mailing list