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RE: 5 uf instead of 1 uf... Hafler (thanks)

Posted by PeterI (A) on November 2, 2007 at 16:03:40

In Reply to: RE: 5 uf instead of 1 uf... Hafler posted by corerosin on November 2, 2007 at 09:42:34:

Thank you. Those of us who have no 'formal' training in electronics (so what the hell am I doing on the DIY board?) have only people's advice to go by.
I have always been told that caps operate best at 75-80%
of their voltage rating so putting a 250-400V rated cap where there is only 30V, for example, actually LOWERS capacitance (?)(maybe only in extreme cases). An EE could maybe address this. But what do I know? - maybe I've been told wrong.

Anyway, hope to have the mods on the Hafler DH-200 completed soon - I feel that I can 'trust' it now. Just don't know where to measure bias - 250mA. Manual doesn't say.

The changes:
15000uf PS caps (original 10000uf) bypassed with 47uf/100 NP
new 10uf NP input cap (possibly bypassed w/ .1uf film caps per DIY board)
all new electrolytics on driver boards
new input jacks, pwr. switch


Pete

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