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DAC-ASH (dac-end 2 up date)

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#81
tube_man88 said:
Hi Quanghao,

I have Toroid Transformer T120 120W 0-200-260-300-360V(100mA)x2 6.3V(2A)x2 5V(2A), can use 6.3 + 5 =11.3V for filament or is it too high ? Also, can we replace R11 470Ohm 5W with power inductor 10H ?

Regards
Click to expand...

You can use 0-200 /100ma for HV
A. About the HV
1. 200 x 1.28 = 256VDc, Use R11 in board IV down 220 R/min 5W, For tube 6h30Pi

2.If you use Chocke change R11, it is ok,
Thus IRF9160 will receive approximately 40V, it will be hotter. You should note heat for it, because I total about 90-99mA, if you use 6h30 or 6h6.
6dj8 is no problem

B Filenment
The AC for filament , it is Hight
EX: (11.3 x 1.4) -2=13.8V, We need 6.3VaC. So 13.8- 6.3 = 7.2V, through Lt184
about 10.8W, heatsink is very hot, and need biger!
You can not use it,

Filament need 7- 8VDC/ min 2A for tube 6h6, 6h30
 
#88
some image DAC-end 2 by my fried
 

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#93
parodielin said:
Would the R-Core Transformer in the link work for Dac End 2? The Salas shunt has six AC saying 9-12V. Does the 100W R-Core have six inputs? How to tell?

Thanks!
Click to expand...

You can fin it:
DIYCLUB
R26-29 primary 115 X 2 : 0-9 X 3(0.7A); 9-0-9(0.7A)

R26-93 primary 115 X 2 : 0-9 (1A) X 2; 0-9 (2A)

DIYCLUB

R26-28 primary 115 X 2 : 0-12(0.85A) X 2; 0-9(0.85A) X 2
R26-29 primary 115 X 2 : 0-9 X 3(0.7A); 9-0-9(0.7A)
 
#97
Hi,

Regarding the below post with the 'dac-ash' is anyone else going/gone with higher ESR caps at the chips?

Salas said:
Super low ESR caps are going to significantly worsen its transient step response by shortening its gain with frequency and by twisting the closed loop phase hard. Now I can't tell whether the digital chips get it worse with higher ESR because I haven't delved in to this DAC, but in this version the decoupling between chips in very high frequencies should not particularly suffer since there is a battery of dedicated regs (if the grounding and stray inductances help too). Thus I would lean into picking ESR to suit better the regs. At least plain vanilla caps are everywhere and cheap.

http://www.diyaudio.com/forums/quan...-dac-end-andrea-ciuffoli-186.html#post2247883
Click to expand...

Was reading this:

If the 47μF capacitor used was actually a
subminiature aluminum electrolytic, the ESR might have been
in the 2 to 5 ohm range. This would have “flattened” off the
capacitor’s impedance before crossing the output impedance
curve and the severe impedance peak would not have
occurred.
http://www.calex.com/pdf/3power_impedance.pdf
Click to expand...

If you can't handle the idea of using standard caps, then giving something like bc 128 (4.2ohm ESR) or some higher ESR tantalums is worth experimenting with. I do have some 270uf oscon SP for the preceding caps C3, C7 etc, but going with bc 128 to start with for IC coupling.

VISHAY BC COMPONENTS|MAL212854479E3|CAPACITOR, 47UF, 10V | Farnell United Kingdom
 
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#98
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