10uF filter cap too small? PSU schematic inside

[jarthel]

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

thanks for the replies

[SY]

Too small for what? What's this supply supposed to do?

[Miles Prower]

It looks just a bit thin, but since this is a regulated PS, it should be OK.

[jarthel]

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?

[sorenj07]

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.

[plate_follower]

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.

[refference]

Hi jarthel ,

If you have a regulated power supply like the schematics
shows up , you don’t 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

[jarthel]

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

[mach1]

If you have a regulated power supply like the schematics shows up , you don’t 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.

[jarthel]

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.