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Old 30th March 2012, 11:33 AM   #31
gadut is offline gadut  Indonesia
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Quote:
Originally Posted by Zen Mod View Post
enough said .

xformer secondaries - 2x18Vac
perfecto, 2 pcs of 2x18Vac 225VA, 4x47.000uF 25V per channel.
while 6x47.000uF 25V per channel seems too big capacitance
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Old 30th March 2012, 11:42 AM   #32
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naah

just use bigger xformers and CRC

go to Duncan's an play with it

learning can be fun

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Old 30th March 2012, 11:50 AM   #33
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Quote:
Originally Posted by Zen Mod View Post
naah

just use bigger xformers and CRC

go to Duncan's an play with it

learning can be fun

PSUD2
Asking, asking, asking always lead to a better result Since Talema only have maximum rating on 18V @225VA, is it big enough for 1 channel? or should I get bigger one such as Antek 2x18V 400VA?
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Old 30th March 2012, 12:12 PM   #34
Zen Mod is offline Zen Mod  Serbia
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just use what's easier to buy/pay/ship

it's anyway hard to sim properly if you don't have exact Rdc values of both primary and secondary

R in CRC will take care of excessive current suck from rectifier and xformer

anyway, be sure that 4x47mF will be already perfect for one channel
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Old 30th March 2012, 12:40 PM   #35
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Originally Posted by Zen Mod View Post
enough said .

xformer secondaries - 2x18Vac

2 x 18VAC?????
I do not remember where or who, but I'm sure you informed on the need to have 2 x 22VAC to power aleph 30 and, in the case of common power supply for both channels, the filter formed by CRC 4 x 22.000uF / 2 x 1 ohm 10W / 4 x 22.000uF
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Old 30th March 2012, 12:47 PM   #36
Zen Mod is offline Zen Mod  Serbia
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oh boy ........

well - I'm sure that I made my homework ........

all roads lead to Rome

if you want 25V caps , 2x18Vac will give you roughly 2x22Vdc

if you use higher voltage caps , be my guest and use up to 25Vac xformer

1R in CRC is a hell , if you ask me
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Old 30th March 2012, 01:00 PM   #37
gadut is offline gadut  Indonesia
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Always look at schematic before doing changes I don't even find any R on Aleph30 original design of "Pass Aleph 30 Owner's Manual", it's only 6x10mF without mentioning voltage rating. I think that CRC design came up on FirstWatt line series

I think that R should be 0R1, using 3 parallel 0R3 5W is my choice
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Old 30th March 2012, 01:16 PM   #38
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Quote:
Originally Posted by Zen Mod View Post
oh boy ........

well - I'm sure that I made my homework ........

all roads lead to Rome

if you want 25V caps , 2x18Vac will give you roughly 2x22Vdc

if you use higher voltage caps , be my guest and use up to 25Vac xformer

1R in CRC is a hell , if you ask me



Sorry,i have too a 22-0-22 Vac trafo with crc psu filter

2x22000uF (40vdc) 0.33ohm 2x22000uF (40vdc) for one only Rail

on the output of psu i have about 27Vdc for each rail.

Please is ok this working voltage?

If no please can you give me some advice about it?
I think I should enhance the resistor of the crc
can you confirm the value and the power of this resistor?
I think 1 ohm 10w should be ok.
I also think the ripple should be ok with these values ​​of CRC.
Thanks in advance.

Last edited by tonimxp; 30th March 2012 at 01:25 PM. Reason: incomplete
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Old 30th March 2012, 01:25 PM   #39
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Originally Posted by tonimxp View Post
Sorry,i have too a 22-0-22 Vac trafo with crc psu filter

2x22000uF (40vdc) 0.33ohm 2x22000uF (40vdc) for one only Rail

on the output of psu i have about 27Vdc for each rail.

Please is ok this working voltage?
just go for it

decrease that R to 0R15 or 0R1
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Old 30th March 2012, 01:32 PM   #40
tonimxp is offline tonimxp  Italy
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just go for it

decrease that R to 0R15 or 0R1
Sorry but decrease means increase the output voltage!

Are you sure?
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