14 Jul
2012
14 Jul
'12
10:21 a.m.
On 14 Jul 2012 at 0:34, Tothwolf wrote:
I replace odd value capacitors all the time in older
SMPSUs and as
long as the values are close, substitutions are generally not a
problem. The hard part I've found is finding modern parts with the
same lead spacing. Sometimes you have to go up a case size and/or
voltage rating to find an electrolytic that will fit the existing
location without putting excessive bends in their leads. This is
especially true with old 3-lead "computer grade" capacitors (typically
two ground leads).
My error--it's a 950 uF cap, not 940 and it still is 40 VDC.
Fortunately, it's an axial-lead cap, so replacement with a physically
smaller size won't be an issue.
It seems to be a filter cap on the +22 supply line, so it's not
critical as regards timing. But the odd value had me wondering--I've
been placing 1000 uF filter caps virtually since there were
transistors. I'd never seen a 950 uF before.
--Chuck