On 5/17/07, William Chops Westfield <westfw@mac.com> wrote:
>
> On May 17, 2007, at 10:49 AM, wouter van ooijen wrote:
>
> > For the LM1117 the ESR must be 0.3 - 22 Ohm, for the LM2940
> > 0.1 - 1 Ohm.
>
> Can one easily measure the ESR of a capacitor configuration?  I'm
> afraid that most of the caps in my collection came without detailed
> datasheets :-(

http://www.google.com/search?hl=en&q=ESR+meter

>
> For purposes of Pick regulators, can you play games with
> paralleling of caps, explicit series resistors, and so on?

Not much. Because the external connection routes are equal or bigger
than specified ESR resitence at given frequency. Plus it have series
inductance which kills the ESR performance.
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