|[AMRadio] Smoothing Choke|
rickbras at airmail.net
Wed May 3 20:04:16 EDT 2006
Thanks Jim and all who replied. I'll check one of my older Handbooks
and see if I can match up the choke with suitable capacitors to get the
ripple as low as possible.
If anyone has a 5 - 25 swinging choke they'd be interested in dealing I
am in need of another one. I'm also going to need a 10 amp choke for
the low voltage supply.
Thanks to all....
Jim Wilhite wrote:
> 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
>> 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.
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