[sdiy] Korg SDD-3000 5 volt supply problems

Richie Burnett rburnett at richieburnett.co.uk
Wed Nov 14 18:32:43 CET 2018

> Often the reason for using tantalum caps was low ESR...

Yes.  And particularly a stable ESR over a range of temperature and 
lifetime.  Whereas Aluminium Electrolytics display a rising ESR with 
decreasing temperature and with increasing aging.  (That's why old equipment 
with a Switched-Mode Power Supply in it often fails like... "It was fine 
when it was on, but there was a power cut or it was turned off for a while, 
(it cooled down,) and when the power came back up, it wouldn't switch on 
again."   Prolonged heat damages electrolytics, but you don't see the full 
extent of the ESR increase until they cool down.


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