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Old 16th March 2010, 12:33 PM   #131
regal is offline regal  United States
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Quote:
Originally Posted by gabanyayaya View Post

Do you use a variable R next to 1000R ? So basically this + the shunt sound better than lampizapor ?
Yes read Salas's 10m45s thread that explains how to set up a CCS. You can get LED's that handle 20+ mA's fine just look at the datasheets. You may want to use a 5842/6c45pi tube for higher gain so you can use a lower I/V resistor. You have to be able to calculate final output to set this up for a DAC and yes it sounds much better than an SRPP, its single ended without cathode output. If you google 6c45pi TDA1541 you will see that most of the orient has switched to this sort of stage rather than SRPP.
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Old 16th March 2010, 12:37 PM   #132
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Quote:
Originally Posted by regal View Post
Yes read Salas's 10m45s thread that explains how to set up a CCS. You can get LED's that handle 20+ mA's fine just look at the datasheets. You may want to use a 5842/6c45pi tube for higher gain so you can use a lower I/V resistor. You have to be able to calculate final output to set this up for a DAC and yes it sounds much better than an SRPP, its single ended without cathode output. If you google 6c45pi TDA1541 you will see that most of the orient has switched to this sort of stage rather than SRPP.
Can you please post a link to Salas's 10m45s thread?
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Old 16th March 2010, 12:42 PM   #133
grufti is offline grufti  United States
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Please Update the list yourselves when you type:
1. Jogi = 2PCB
2. qusp= 2-3PCB
3. Bas Horneman = 2 PCB
4. hihopes = 2PCB
5. guglielmope = 2PCB
6. Ryssen = 2PCB
7. kstlfido = 6PCB
8.cygnus x1 = 8PCB
9. regal = 4PCB
10. le`flu = 4 PCB
11. vgeorge = 2 pcb
12.jameshillj = 2 pcb
13.dodo = 1 pcb (one)
14.normundss = 2-3 PCB
15. stoolpigeon 4 PCB
16. Nikon1975 = 2 PCB
17. pchw = 4 pcb
18. boudy = 2 PCB
19. Yunick = 1 PCB
20. JimS = 4PC
21. Cambe = 3 PCB
22. av-trouvaille = 6-8 pcb
23. Jean-Charles = 4 pcb
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26. Zekk needs ONE
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40. grufti = 2 PCB


added 2 pcb. thanks
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Old 16th March 2010, 12:53 PM   #134
noizas is offline noizas  Lithuania
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Quote:
Originally Posted by gabanyayaya View Post
So you saying SRPP only need a simple PSU like CRC filter....rather than the shunt...?
No, I had idea that you can use one shunt regulator for both channels, separating power supply for L and R channels via CRC filters (like in your drawing).
Theoretically this is ok, as BALANCED SRPP uses constant current.
Balanced SRPP means, that output capacitor is loaded with load, for that was calculated - LOAD IS PART OF SRPP!

So if you are loading SRPP not exactly R you are designed for, you will have non A class here - distortion.

So two shunt regulators are exactly in place with SRPP, when those are NONbalanced

Seriously would recommend you to use SE for I/V stage - plate follower or grounded cathode. Or even better mumetal transformer, but this is another story...
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Old 16th March 2010, 01:24 PM   #135
piero7 is offline piero7  Italy
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Quote:
Originally Posted by quanghao View Post
Simpler Simplistic design by Salas

A. Information about Salas shunt:
Simplistic Mosfet HV Shunt Regs

Thank you Salas
_______________
B. Information PCB
+ One PCB:
2 x Simpler Simplistic
2 x Heater Power Supply+ Quality:
two layers , gold-plated, 1.6 mm thickness

C. The price includes:

PCB + Shipping (surface mail) + fee PayPal :

1. PCB = 30$
2. PCB = 55$
3. PCB = 85$
4. PCB = 110$

Hi everyone. Current everything I was ready to submit designs for manufacturers to make circuits.

So you have registered, please let me transfer the funds to my order soon.

Time to receive funding to start from today to 16-3-2010
When I receiving funding will be made immediately,
on the 22-3 production was finished 2 – 4 - 2010
Then I will send the first day for all of you!

Thank you and please transfer money to my account
My papal account: quanghao168@yahoo.com.vn



quanghao from 15$ each pcb as you wrote me in MP now the price is just double, don't you think it's a bit too much for surface mail?
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Old 16th March 2010, 01:25 PM   #136
AndrewT is offline AndrewT  Scotland
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$30 U.S. is dear, very dear for a PCB.

What's going on here?
__________________
regards Andrew T.
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Old 16th March 2010, 02:01 PM   #137
noizas is offline noizas  Lithuania
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Quote:
Originally Posted by AndrewT View Post
$30 U.S. is dear, very dear for a PCB.

What's going on here?
30 USD for 2 x simpler simplistic + 2 x filament PSU regulator, totally 125mmx 250mm PCB, is not so expensive, IMHO.

Same size, but not gold plated bare regular PCB in ebay shops costs 15 - 22 USD even without delivery cost.

Here we have delivery and Paypal fee already included.
And this is not regular production of bare PCB...

Regards
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Old 16th March 2010, 02:50 PM   #138
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Quote:
Originally Posted by regal View Post
Yes read Salas's 10m45s thread that explains how to set up a CCS. You can get LED's that handle 20+ mA's fine just look at the datasheets. You may want to use a 5842/6c45pi tube for higher gain so you can use a lower I/V resistor. You have to be able to calculate final output to set this up for a DAC and yes it sounds much better than an SRPP, its single ended without cathode output. If you google 6c45pi TDA1541 you will see that most of the orient has switched to this sort of stage rather than SRPP.
I like the circuit just now, simple to build but I have a V-out DAC...witht is work?
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Old 16th March 2010, 03:17 PM   #139
noizas is offline noizas  Lithuania
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Quote:
Originally Posted by gabanyayaya View Post
I like the circuit just now, simple to build but I have a V-out DAC...witht is work?
Schematic that you provided us is compatible with low signal I-out DAC as TDA1541, AD1865, etc (just different R I/V needed). It is simply too high gain for V out type DACs with 1 - 2V RMS ready.

For V-out DAC with opamp V output ready I would use cathode or anode follower, based on 6N6P or something like that valve. Schematic and calculation you can find in lampizator site, just google "lampizator 6N6P".
If supply voltage or tube type is not ok for you, let me know, I can help with calculations.

However take care - Vout as usual is worse approach, than I -out (except few TDA, AD and Wolfson DAC). And you will have one more capacitor in chain.
So the sound can be not so natural, IMHO.
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Old 16th March 2010, 03:30 PM   #140
adamus is offline adamus  United Kingdom
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not really, it will have too much gain.

EDIT - beaten to it with a much better answer....
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