Aleph J Schematic

[schultzsch]

just read few post and from there i understood that schottky are better

 

[jameshillj]

"Soft Recovery" ones, rather than the "Hyper fast" ones (quite a difference in practice) and try to keep them cool (ie good heatsink)

 

[Zen Mod]

the other ones were these http://ixdev.ixys.com/DataSheet/DSS2x101-015A.pdf

are they better?

yes they are

but - will you hear the difference ......... is another issue

 

[schultzsch]

mmm...few chances cause my ears aren`t very well trained.

 

[schultzsch]

do you reccomend to use snubber circuit to eliminate ringing?

 

[Zen Mod]

nope with those

 

[schultzsch]

thx...you are always close when I need an answer

 

[Zen Mod]

it's convenient to place one over (each) secondary

 

[schultzsch]

so...i have dual secondaries 2x19.5v and 500VA toroid.i will need a value between 7-8nF i guess :-??

 

[Zen Mod]

yup

everything between 6n8 and 8n2 will do fine

 

[schultzsch]

thankssssss!!! many thanks!!!

 

[schultzsch]

saved the picture cause i guess it will serve me at many other projects in the future

 

[schultzsch]

K...so I use 4 of these http://ixdev.ixys.com/DataSheet/DSEP2x31-12A.pdf for getting together 2 bridges for one channel, solved one problem.
I also have http://ixdev.ixys.com/DataSheet/DSS2x101-015A.pdf but not enough for getting together 4 bridges and I was wondering if they are better to use between earth and ground? (if Vrrm is not too low)

 

[Zen Mod]

use 10R NTC between chassis and GND

save those biggies for something else

5A NTC is OK

 

[schultzsch]

read somewhere that with diodes work better and if I have them on hand why not to use them, they`ll get rusty if i`ll let them in the bag )

 

[schultzsch]

anyway is there a difference between ntc and diodes?

 

[Zen Mod]

whatever you choose .......

diodes or NTC will work only to save your a$$ in case of major malfunction

 

[schultzsch]

yes....but I don`t know if I have bought for sure ntc`s also for gnd earth connection, remember only of those for mains.If allready ordered I will use them if not...remain the diodes(aren`t they reacting faster than the ntc`s?)
thanks

 

[Zen Mod]

time for beer and sleep

you're thinkin' too much

just use what you have in drawer

 

[schultzsch]

i know...but in the near future I`m going to start building the cases and after putting all together(after some final orders(psu caps and connectors)) and I want to be prepared. it`s my first serious project and I don`t want to screw it