[Amps] How much electrolitic for a HV supply ?

[Peter Frenning [OZ1PIF]]

Hamilton Horta - PY2NI skrev:
>     Hi everybody, is there any rule of thumb or whatever to determine the
> minimum
> amount of electrolitic caps should one put in a HV power supply?
>     I am building a VHF PA with 1x GI-7B @ 2200V and another for a friend of
> mine with 2xGI-7B, I know that we are usually biased to use as much as
> possible but I am really eager to know the minimum for these two amps
> running 1xGI-7B and one with 2xGI-7B both operating at 2200V.
>
> Thanks a lot.
>
>   
Hi Horta,
It's mostly a question of availability of suitable Caps. A well suited 
common type is 450V/220uF, you could get by with 6 in series, but that 
is cutting it very close, prudence would say use 8 in series giving a 
reasonable margin on V and some 27.5uF - that'll do at least up to 500mA 
and likely substantially more.
I'm using this configuration in both a 2200V supply for a Gi7b (144MHz) 
and a 3000V supply for a QB-4/1100 (HF), both has given trouble-free 
operation for several years and good reports on audio quality.

-- 
Vy 73 de OZ1PIF/5Q2M, Peter
 
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Peter Frenning
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