Hi there
It is some while for me writng again something. Personal things led me away from audioo hobby.
But i am back and have much fun again with building stuff.
Lately build an Hiraga amplifier with PCB' s friom Jims audiio, the kubota reg version
I decided to give it a LCL poiwer supply with 80 mH Lundahl chokes LL2772. After first fire up it sounded rather good, but after few tracks and some run in the upper bass is too loud, and bass is boomy, and treble with shshs sounds. Though i calculated the LCL ps with Duncans PS designer it is not sounding right. After removing the chokes out of circuit and there in place 0,33 ohm resistiors, so in fact a Pi filter it sounded much better. Better bass responce and less sibilance
This is my first attempt:
500VA toroid transformer to bridge rectifier with Fets ( diyaudio group buy, from Prasi) > 75000uF> 80mH choke> 31000+31000 uf, each rail/ and each channel apart
so per channel total of 274000 uF of capacity
LL2772 choke is connected in common mode fot extra filtering, the 1+ A bias DC current is then counteracted in the core of the choke
Maybe i should have chosen a bigger coil with less resistance, or add a resistor after the choke, or should choose another capacity distribution (eg first 31000 then choke, then 75000+31000 to amp.)
Matter of fact is the filtering looked good on PS designer, but in AC function with music it is a whole other story. Does anybody have same results with CLC PS ?
It is some while for me writng again something. Personal things led me away from audioo hobby.
But i am back and have much fun again with building stuff.
Lately build an Hiraga amplifier with PCB' s friom Jims audiio, the kubota reg version
I decided to give it a LCL poiwer supply with 80 mH Lundahl chokes LL2772. After first fire up it sounded rather good, but after few tracks and some run in the upper bass is too loud, and bass is boomy, and treble with shshs sounds. Though i calculated the LCL ps with Duncans PS designer it is not sounding right. After removing the chokes out of circuit and there in place 0,33 ohm resistiors, so in fact a Pi filter it sounded much better. Better bass responce and less sibilance
This is my first attempt:
500VA toroid transformer to bridge rectifier with Fets ( diyaudio group buy, from Prasi) > 75000uF> 80mH choke> 31000+31000 uf, each rail/ and each channel apart
so per channel total of 274000 uF of capacity
LL2772 choke is connected in common mode fot extra filtering, the 1+ A bias DC current is then counteracted in the core of the choke
Maybe i should have chosen a bigger coil with less resistance, or add a resistor after the choke, or should choose another capacity distribution (eg first 31000 then choke, then 75000+31000 to amp.)
Matter of fact is the filtering looked good on PS designer, but in AC function with music it is a whole other story. Does anybody have same results with CLC PS ?
