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RE: 5R4G and 5U4G condenser output value

It's not the value of the first cap per se.

It's the value of the repetitive peak charging current that happens at twice the line frequency.

The more resistance in the secondary the more capacitance you can get away with.

If you use a low DCR power transformer then you will be forced to use a low value first cap.

If you use a critical value input choke then you can use as big of a cap after the choke as you want.

BTW All of this information is on the datasheets. When the datasheet shows 4uf (or whatever) that assumes the required DCR is present in the secondary of the power transformer. If there is less than the required DCR then you can get into trouble with less than the stated 4uf (or whatever).


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  • RE: 5R4G and 5U4G condenser output value - Tre' 16:49:03 01/21/17 (0)


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