DAC-ASH (dac-end 2 up date)

[Strosek]

Finally done!! The boards anyway...

DAC2.jpg

DAC3.jpg

[quanghao]

[QUOTE=Strosek;2293766]Finally done!! The boards anyway...

It is wonderful!
You listen to it?? Can you tell all friends and me please ??
Quanghao

[Strosek]

No not yet... I just used a single 12 volt transformer to test each power supply one at a time but I'm still waiting on Bud P. for the transformers that will power both boards.

Just wanted to post the completed boards in case it helps others. I'll be upgrading a few caps but for now this is it!

So far these have been a very well designed boards!

Thanks Quanghao

[quanghao]

Originally Posted by Strosek

No not yet... I just used a single 12 volt transformer to test each power supply one at a time but I'm still waiting on Bud P. for the transformers that will power both boards.

Just wanted to post the completed boards in case it helps others. I'll be upgrading a few caps but for now this is it!

So far these have been a very well designed boards!

Thanks Quanghao

thank you for compliments. I found you to invest carefully DAC

[tube_man88]

Hi Quanghao,
Need help to trouble shoot the B+ for IV board. I using 6H30 tube, transformer 200Vac. The HV regulator can set the voltage 230V without tubes in. After plug in the tubes and power on, the voltage drop to 137V when tubes heated up and cannot adjust up higher. AC in measures 216V, dc is 275V before R1 22Ohm and 248V after. The DAC-End board is fixed and all +/- 5v supply is working.

[quanghao]

Originally Posted by tube_man88

Hi Quanghao,
Need help to trouble shoot the B+ for IV board. I using 6H30 tube, transformer 200Vac. The HV regulator can set the voltage 230V without tubes in. After plug in the tubes and power on, the voltage drop to 137V when tubes heated up and cannot adjust up higher. AC in measures 216V, dc is 275V before R1 22Ohm and 248V after. The DAC-End board is fixed and all +/- 5v supply is working.

Maybe you used too large for the tube line 6h30, do you reduce the value of resistor R1 20 Ohm down 18-20 Ohm, you adjust the voltage up as you! You check the voltage drop in R22,21,37,38 = 200R is how much?

[tube_man88]

Originally Posted by quanghao

Maybe you used too large for the tube line 6h30, do you reduce the value of resistor R1 20 Ohm down 18-20 Ohm, you adjust the voltage up as you! You check the voltage drop in R22,21,37,38 = 200R is how much?

Yea, I just check and R1 I made a mistake was 33 ohm,too high not 22R. Voltage drop at R22,21,37,38 = 220R <- (220 is ok?) is 2.6-2.85V.

[quanghao]

Originally Posted by tube_man88

Yea, I just check and R1 I made a mistake was 33 ohm,too high not 22R. Voltage drop at R22,21,37,38 = 220R <- (220 is ok?) is 2.6-2.85V.

No!
R1 set current for SSHV Supply =22 Ohm, Ia ( I total ~95-100 mA)
So Iv need total= 80mA, 1/2 Triode 6h30 need 18-20mA.( the sound is the most )

And Voltage at Anode =90-100V,

So voltage at R 22, 21,37,38 =3.8-4V , and R =200-220 Ohm, it is ok!
Thanks

You see it???

[quanghao]

[QUOTE=BudP;2292895]Hi everyone,

Very professional! You can keep this price and additional output is not? namely: 8 or 10 outputs 9V/500mA. Thank you!
I'd love to have one like that!
Quanghao

[tube_man88]

Originally Posted by quanghao

No!
R1 set current for SSHV Supply =22 Ohm, Ia ( I total ~95-100 mA)
So Iv need total= 80mA, 1/2 Triode 6h30 need 18-20mA.( the sound is the most )

And Voltage at Anode =90-100V,

So voltage at R 22, 21,37,38 =3.8-4V , and R =200-220 Ohm, it is ok!
Thanks

You see it???

I have set R1 to 20R (33//47R) and Voltage at R22, 21,37,38 =4.1-4.2, and Voltage at anode 89-90V, B+=197, should this be ok, or need to drop R1 lower to increase B+ ?