[aprssig] LM7805 and caps
Andrew Rich
vk4tec at people.net.au
Sun Aug 26 16:36:50 EDT 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 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 ?
Curious
----------------------------------------------------------------------------
Andrew Rich VK4TEC
vk4tec at people.net.au
http://www.tech-software.net
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
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.tapr.org/pipermail/aprssig_lists.tapr.org/attachments/20070827/ac57dc3c/attachment.html>
More information about the aprssig
mailing list