[rescue] Sun Voyager: a) great story b) repair question c) looking for a new home

[Maciej W. Rozycki]

On Thu, 4 Nov 2021, John Hudak wrote:

>  Usually suppliers will have a column in their selection guide
> that will note 'low ESR'.  Things get a little confusing because mfg don't
> always specify ESR values the same way.  The most common way is: Low ESR
> down to [mN) @ 20B:C / 100kHz].

 This will often be given as "low impedance" or "high ripple" instead, and 
possibly marked "for SMPS".  I've paid attention to long endurance too in 
part selection; note that with the drop of working temperature endurance 
doubles by every 10B0C.  Of course high ripple current as present in parts 
used in SMPSs combined with insufficiently low ESR causes the rise of the 
part's temperature from the heat produced (E = IB2 x R x t), and you can 
figure out easily how it affects the part's lifetime.  I tend to chase 
catalogue pages for the original parts so as to make sure any substitutes 
have the impedance/ESR preferably lower.

 So choose your replacements wisely!

  Maciej