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Old 31st December 2013, 02:31 PM   #3261
shoom is offline shoom  Europe
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Join Date: Jul 2010
Location: Worcestershire
Quote:
Originally Posted by Joachim Gerhard View Post
We have being talking about a low cost alternative to the OPA627 as a servo.
There is a new precission Fet Opamp from BB :
http://www.ti.com/lit/ds/symlink/opa2140.pdf
This one really has great DC specs, very low distortion, low noise and a wide PSU voltage range.
Needs a DIL adapter though to be used in the Paradise.
I have not tried it so far. Even for me as an opamp neard it is hard to catch up whats new and usefull.
Now that looks like a good find.

The change to OPA627 was expensive but worthwhile in lowering the DC offset.

I've used SO 8 adaptors before and it's not so hard to do.

The OPA140 like a good cost effective alternative for those that use equipment where low offset matters.


Bad burgers seem to be an international phenomenon which we have our fair share of here.

Go for the bratwurst next time.
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Old 4th January 2014, 02:27 PM   #3262
shoom is offline shoom  Europe
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Hi Guys

After a few weeks of settling down to the new Paradise sound I must say it’s just been bliss listening too many of my old forgotten favourites again.

My record collection never sounded so good

Fast, dynamic, sweet, soulful with so much detail it’s hard to believe that I still have the same cartridge connected and not a much more expensive one.

BTW it’s soooo quiet even by Solid state standards. No hum (good work Alfred/Frans) and very, very little hiss.

The paradise has me wondering how much more it has in the tank so I think it’s going to be the Terminator next (I love linear and even the humble one I have blows my Tabriz ZI away).

I’ve built a few Phono stages and each time I finish one I say to myself ‘’never again’’ because they tend to magnify my mistakes too well.

Well this time ‘’never again’’ just means that I think that the Paradise is just about as good as it gets.

Thanks again Guys for a truly wonderful phono preamp.

anyone who has boards should get building. it's well worth the effort.
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Old 4th January 2014, 06:43 PM   #3263
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I think I have a better setup now. I found that the Clio noise level measured depends on the input attenuator setting. If I lower the input I got this noise floor from the Paradise. No more 60Hz spike, and nice RIAA curve can be seen. I've been listening to the Paradise with the OPA627 now, and there is no noise at all. It is a very silent preamp. Excellent
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Old 4th January 2014, 09:04 PM   #3264
shoom is offline shoom  Europe
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Hi Algar

Have you tried the Calvin buffer OP yet?

Could make your great build sound even better.
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Old 4th January 2014, 09:21 PM   #3265
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Can you point me to this buffer original post? Thanks... SB
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Old 4th January 2014, 10:28 PM   #3266
shoom is offline shoom  Europe
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Quote:
Originally Posted by Algar_emi View Post
Can you point me to this buffer original post? Thanks... SB
sure can

This may be a good place to start.

http://www.diyaudio.com/forums/group-buys/239776-calvin-buffer-paradise.html

The first post has the build guide pdf which should give you enough for one of your beautiful etches.

It was also discussed more deeply on the MPP thread and here also

http://www.diyaudio.com/forums/analog-line-level/226099-preamp-buffers-simple-idea.html

If you’d like a little more reading.

BTW your positive feedback on using the OPA627 made me decide to try to squeeze the DC offset just a little harder.

It works really well in my build.

Thanks
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Old 5th January 2014, 07:08 AM   #3267
amsoque is offline amsoque  Romania
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Hi.
Nice design and very versatile shunt regulator. I have built one in order to supply +- 26 volts for a preamp. Stable and not hot at all. All I did was to increase the number of leds, lower the 10 ohm resistor, and add another heat sink the same dimension for the power transistors.

So it's feasible as a stand alone shunt regulator. Why not a thread as for the salas shunt?

Emil
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Old 7th January 2014, 03:35 PM   #3268
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I'm currently getting started with my build,

Does any guy sell his preregulator/Calvin buffer PCBs???

Otherwise, a link to the PCB artwork would be appreciated as well...

Regs, Dirk
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Old 7th January 2014, 06:57 PM   #3269
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by amsoque View Post
Hi.
Nice design and very versatile shunt regulator. I have built one in order to supply +- 26 volts for a preamp. Stable and not hot at all. All I did was to increase the number of leds, lower the 10 ohm resistor, and add another heat sink the same dimension for the power transistors.

So it's feasible as a stand alone shunt regulator. Why not a thread as for the salas shunt?

Emil
Maybe, we have been looking into this.
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Old 9th January 2014, 09:57 PM   #3270
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Default Calvin Buffer Questions

I'm building the Calvin Buffer and I have a few questions. The Calvin buffer building guide has a schematic, and a parts list. Parts value in the list don't match the schematic. For example R5,R7 on the schematic are 6.8 ohms. The parts list closest value that I can guest is 22R, because R6,R11 are 2.2R on the schematic and in the BOM.

What are the correct values, is it the schematic or the BOM?

According to Calvin Q1,Q4 must be matched, Question at what IDSS?
The buffer assembly guide mention after the parts list that the input FET can be SK170 matched at 8.5ma. Do we need to match Q1,Q4 PF5102 at 8.5ma as well?

Thanks...
SB
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