Aleph 30 the best choice of C1 C2 C3 on brian gt PCB

[gadut]

Originally Posted by Zen Mod

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

[Zen Mod]

naah

just use bigger xformers and CRC

go to Duncan's an play with it

learning can be fun

PSUD2

[gadut]

Originally Posted by Zen Mod

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?

[Zen Mod]

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

[vivanco]

Originally Posted by Zen Mod

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

[Zen Mod]

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

[gadut]

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

[tonimxp]

Originally Posted by Zen Mod

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.

[Zen Mod]

Originally Posted by tonimxp

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

[tonimxp]

Originally Posted by Zen Mod

just go for it

decrease that R to 0R15 or 0R1

Sorry but decrease means increase the output voltage!

Are you sure?