ACA amp with premium parts

[triode_al]

The larger SMPS (like Meanwell RSP series) have current limiting protection mode instead of (the awfull?) hick-up mode. That is great when you have very large caps - I have 56.000µF in one build like above.

Protection type : Constant current limiting, recovers automatically after fault condition is removed

So when the cap is full it starts to offer a stabilized voltage.

 

[turion64]

Thanks for the info!

Any CRCR filtering during/after the the 56,000 uF caps?

Pete

 

[chiily]

hi TA

Can you give me a hint please where the pcb from Rudi can be found. you refered in post 1385?

is here a PCB -gerber available about ACA with TA mods?


sound after amyalice -SMPS filter:
i want to share my experience with this SMPS filter:

my setup is still small. i use a meanwell LRS 24V/150W SMPS brick in a seperate housing. I filtered every channel with this filter. the rail on the amp pcb is 24V and the DC point is 12,5V. i use the zerozone pcb with TA mods in a small chineses housing with 1,5A bias . MOSFETS are IRF044N and i am happy with the darkness of the tuning.

you should try this !!
SMPS Filter - AmyAlice

chris

I have a built ACA from Rudi's PCBs that sell onwards.

https://flic.kr/s/aHsmSnQzWZ

 

[chermann]

hi chiily

looks very nice your amp. For me the tranformer looks quite small. on pic i see 72VA?

What is that for a type and which voltage and bias are you using with them?

kr
chris

 

[chiily]

I've actual changed the transformers for a toroidal one, 300VA, 2x22V. They have active rectifiers too, so there's no diode loss.

 

[josewon]

I have an ACA amp
I assembled it roughly, but it sounds so good
I couldn't believe it was an audio product born with my own hands.
I upgraded it once with premium parts
And I'm really curious about the tuning after that

But I can't get IXTQ75N10P, FQH44N10.
However, I can buy FQH44N10-vb, so what if I use it?
I'd like you to tell me the most realistic alternative.

I'm sorry for my poor English.

 

[chermann]

try it and listening.
then change it to an other MOSFET if you like.
kr
chris