15 Jul
2012
15 Jul
'12
2:26 a.m.
Tony Duell wrote:
Maybe simple size considerations are the cause for this. Maybe the
Condenser manufacturer would'nt guarantee that 1000?F wil fit in a can of
the desired size for the pcb, so they moved the specs down to 950.
One of my customers here is an electrolytic condenser manufacturer, Frolyt.
Regards,
Holm
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I'm getting around to doing some work on my veneered and generated
HP5307A frequency counter. Looking at all the gold-plated PCB
goodness inside, the first thing that jumps out at me is a bulging
electrolytic. It's a 940 uF, 40V unit. Not 1000 uF, but 940. Not
50V, but 40V. I'm going to substitute a pair of 470uF, 50V units
paralleled as a substitute, but this had me wondering if anyone knows
why the strange values, particularly since +/-20 percent tolerances
are common on electrolytic caps.
I'e wondersd about this before (I may even have posted about it). I
can;'t see any electrical rason why they would use such capacitors. I've
seen a PSU board where the smoothing capacitors for the inputs to various
regulators were a mix of (I think( 5600uF and 6000uF, again +/-20% (at
least). Why theey didn't specify and ft al lthe same type is beyond me.
I hae no idea what the 1000uF capacitor in your counter is for, but I'll
guess it's i nthe PSU. I would be _very_ suprised if a 1000uF didn't work
correctly there too.
-tony