10uF filter cap too small? PSU schematic inside - diyAudio
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Old 18th October 2006, 02:18 AM   #1
jarthel is offline jarthel  Australia
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Default 10uF filter cap too small? PSU schematic inside

http://img154.imageshack.us/my.php?i...titled1an8.png

thanks for the replies
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Old 18th October 2006, 02:44 AM   #2
SY is offline SY  United States
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Too small for what? What's this supply supposed to do?
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Old 18th October 2006, 02:48 AM   #3
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It looks just a bit thin, but since this is a regulated PS, it should be OK.
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Old 18th October 2006, 03:30 AM   #4
jarthel is offline jarthel  Australia
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Quote:
Originally posted by Miles Prower
It looks just a bit thin, but since this is a regulated PS, it should be OK.

what value would you recommend?
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Old 18th October 2006, 03:43 AM   #5
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i'd go like 100uF, but seeing as it's a choke input, anywhere up to around 200 should be all right. it also depends on what tube you're using to rectify.
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Old 18th October 2006, 04:41 AM   #6
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Why not use a 47uF @630v cap if you want to stick with Solen? 10uF is a bit low, and you can go fairly high after the choke. But if you're regulator is good it may not matter much.
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Old 18th October 2006, 05:10 AM   #7
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Hi jarthel ,

If you have a regulated power supply like the schematics
shows up , you donít need to use a CHOKE INPUT FILTER ,
If I was you , I'd prefer a CAPACITOR INPUT FILTER ,
with a 47 uf x 450 V , before the choke , and after the choke
a 100 uf x 450 V . If you want more reliability and more
velocity from your power supply , you can use at the input
( in the place of 47 uf x 450 V electrolytic ) a motor run
capacitor ( polypropilene ) rated for 380 Volts AC .
The Solen capacitor is very expensive for this purpose !!

Carlos
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Old 18th October 2006, 05:48 AM   #8
jarthel is offline jarthel  Australia
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thanks for the reply

I already have a 100uF ASC I was planning to use but these are quite rare to find so I was wondering if I can use the solen instead.

I also need to use choke input as target B+ is 150V and my transformer is a 230VCT. 230VCT into a cap input = lots of voltage to drop! :|

thanks everyone for the help
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Old 18th October 2006, 07:55 AM   #9
mach1 is offline mach1  Australia
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Quote:
If you have a regulated power supply like the schematics shows up , you donít need to use a CHOKE INPUT FILTER ,
.

I beg to differ - I use an almost identical setup and the superiority of choke input over cap input is quite clear even after regulation.

I use only 10uF and it works fine and also allows you to use a really good cap (quality is more important than size in this application). The shunt reg can be easily improved by using the tube for AC reg (feed +ve rail back into tube grid via a cap) and the TL431 for DC.
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Old 18th October 2006, 07:57 AM   #10
jarthel is offline jarthel  Australia
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Quote:
Originally posted by mach1
.

The shunt reg can be easily improved by using the tube for AC reg (feed +ve rail back into tube grid via a cap) and the TL431 for DC.

any chance of a rough schematic? thank you.
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