>Hi group,
>
> Does anyone have any info on these units, or rather any preference as
>to which would be best used in an amp HV supply...
>
>Maxwell Cat# 30580 54uF 4.2Kv
>
>Maxwell Cat#38697 35uF 5.1Kv
>
>These I just could not resist at a local electronics 'junque' shop. One
>(30580) is labelled as being the NOS spare for a defibrilator, and is
>slightly smaller than it's lower capacitance sibling. Now I don't fancy
>making an Amateur Defibrilator, but it saves space on electrolytic strings
>in the PS case.
Defibrillator (and flash service) capacitors save space by using
thinner-foil. They can do this because they are not subject to high
average ripple current -- i.e., ESR is not a consideration in the
design. For contesting, derating to about 60% of the peak-V rating is
probably a good idea. Also, moving air around such caps might help to
dissipate the heat caused by the increased ESR.
>
>Is it advanced technology (castor oil in the 54uf one, unspecified but
>non-pcb containing in the other) that makes the size difference, or is
>there some other issue?
>
>73
>
>Adam
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