When does ripple cause problems?  Will a rippled (rippling?) input cause a problem with PICS?  More specifically, let's say I'm using a PIC to blink LED's or control a small stepper motor.  Would this be a problem?

-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of Olin Lathrop
Sent: Thursday, May 12, 2005 1:28
To: Microcontroller discussion list - Public.
Subject: Re: [EE] Will phone charger work as a 5v DC power supply?

kenasw@btinternet.com wrote:
> Regulated mean that the voltage will be what was written on the box
> and the ripple is reduced to something insignificant, so you might get
> 5.000V with no load and 5.001V with load.

You might, but that would be very impressive even for a regulated power
supply!

Also, regulated doesn't necessarily mean no ripple.  Regulated only means
that there is something that is actively trying to maintain (regulate) the
output voltage despite variations in input voltage and load current draw.
Many switching power supplies are well regulated, but have significant
ripple too.  There are many parameters for measuring power supply
performance, and "regulated" only tells you a little about the
implementation.


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