[AMRadio] Smoothing Choke

Jim Wilhite w5jo at brightok.net
Wed May 3 17:33:52 EDT 2006

Rick pick up and old ARRL handbook.  I have a 56 year version and it has 
charts that will help you determine the percent of ripple with various 
combinations of L and C.

If you use 4 uf. and 5 H with choke input, it says the ripple percent will 
approximate 4%.  Usually 5% is where most people go since it takes such 
large values to exceed that.

73  Jim

> Hi:
> I am finally building the power supply for my ART-13 transmitter and would 
> like your opinion on a thing or two.  Thanks to Ronnie Hull, I have a  5 - 
> 25 henry swinging choke for the HV supply.  I also have, thanks to an old 
> TX-1, a 400 ma smoothing choke, 5.5 henry @ 400 ma.  I wanted to use 
> something a little larger, maybe 10 or 12 henry.  I'm using 866 or maybe 
> 3B28 rectifiers and 4 mfd and 8 mfd filters.  Do you think the 5.5 henry 
> choke will be sufficient?
> I also need another 5 - 25 swinging choke in the 250 ma range for the 400 
> volt supply.  It too will use another 5.5 henry choke if it is determined 
> that is sufficient.
> Any and all advice, opinions, criticism or comments are welcome.
> Thanks,
> Rick/K5IZ

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