11/45, sick or not? - test-drb@ccmp.vtda.org

6 Jul 2005

...
 From: "Jay West" <jwest at
classiccmp.org>

Joe wrote...
   Are you sure that the lights aren't blinking
too fast to see? Perhaps you
 can hang a logic probe (with a pulse extender) on one of the lights to be
 sure. 
I'll try that tomorrow... but I wouldn't think that is what is happening. 
Also, pardon my lack of knowledge, but... shouldn't I be seeing the .2v 
ripple as an AC component (ie. a sine wave)? It's a very clear perfect 
sawtooth. And it's exactly the same on all the 5V regulators, which strikes 
me as odd.

Jay 

Hi Jay
 No, the ripple on a rectified filter will look like a
saw tooth. If you look carefully, you'll see that the leading
edge follows the AC while the trailing has a slight dip.
This is normal.
Dwight