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Zion, a ready made Phono Stage by the Paradise team
Zion, a ready made Phono Stage by the Paradise team
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Old 19th September 2016, 07:29 PM   #21
FdW is offline FdW  Netherlands
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Zion, a ready made Phono Stage by the Paradise team
Quote:
Originally Posted by hesener View Post
what are q19-q22 doing, if I may ask? thermal compensation?
And Q20, Q21 balancing the PNP/NPN Vbe differences in the current stage. It is done to make the work of the auto-servo easier/lighter.
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Old 23rd September 2016, 12:13 AM   #22
Joachim Gerhard is offline Joachim Gerhard  Germany
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I have the prototype playing in my system !
I am surprised that it was such an easy build. It worked right away after eroding some little bugs.
Hum is more or less non existent when i earthed correctly.
This version has an INA at the output to do the Bal-Unbal conversion. The only " special " thing i did is the way i biased the input of the INA. It is like Bruno did in in the Linear Audio preamp.
Set up this way hiss is lower then in the version i published before.
Frans has an idea how to improve on the INA and keep the low noise.
The sounds seems fine too. The main thing that i noticed is that the bass is very potent.
That can be my implementation of the RIAA that has a little bass lift, maybe 0.5dB.
I did not have the excat values at hand that Frans calculated.
A little left turn on the Subs volume solved that issue.
A question came up if we can make the gain adjustable. What i whould really like to do is some kind of volume control that has Bal and Unbal out. Then we have a stand alone unit for all purposes that does not need a preamp. The volume control could also be used to EQ volume diffences in the cartridge if there are any.
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Old 24th September 2016, 10:15 AM   #23
Calvin is offline Calvin  Germany
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HI,

if You use a ´3-OPAmp´ INA (unbalanced out) its easy to vary gain with a single resistor between the inverting inputs of the INA´s two input OPAmps.
To generate balanced outputs I´d use two INAs in parallel (the second just with its inputs crossed).
Then a Dual-pot or pairs of discrete resistors would allow to vary the gain.
Feeding the ref-inputs of the 3rd OPAmps of the INAs would allow to DC-servo the INAs.

jauu
Calvin
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Old 24th September 2016, 05:19 PM   #24
RCruz is offline RCruz  Switzerland
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Zion, a ready made Phono Stage by the Paradise team
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Old 24th September 2016, 05:37 PM   #25
FdW is offline FdW  Netherlands
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Zion, a ready made Phono Stage by the Paradise team
Quote:
Originally Posted by Calvin View Post
HI,

if You use a ´3-OPAmp´ INA (unbalanced out) its easy to vary gain with a single resistor between the inverting inputs of the INA´s two input OPAmps.
To generate balanced outputs I´d use two INAs in parallel (the second just with its inputs crossed).
Then a Dual-pot or pairs of discrete resistors would allow to vary the gain.
Feeding the ref-inputs of the 3rd OPAmps of the INAs would allow to DC-servo the INAs.

jauu
Calvin
But we will not
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Old 24th September 2016, 06:34 PM   #26
Calvin is offline Calvin  Germany
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Hi Papabear,

I assumed You'd say that

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Old 29th September 2016, 09:18 AM   #27
FdW is offline FdW  Netherlands
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Zion, a ready made Phono Stage by the Paradise team
Default Maximum Amplifier Decoupling

First of all, I need to apologize, the project is not moving forward as speedy as should be, but I do promise you (all), we will get there

The project will be using 4 opamps, and they will be deployed in a technologie that I will call (from now on) "Maximum Amplifier Decoupling" or short MAD(c).

Each opamp will be placed on it's own board, the board will contain independent PSU filtering for each opamp and also will prevent 'back-flow' of signal from one to the other(s) opamp(s). All higher impedance circuitry will be contained (and limited) to these board(s) to minimize crosstalk between the opams, balanced (+ to - side) and foreward (previous to next, and or, next to previous opamp(s)). These boards will have a ground plane for (one of the) the same reason.

Last edited by FdW; 29th September 2016 at 09:23 AM.
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Old 30th September 2016, 09:59 AM   #28
FdW is offline FdW  Netherlands
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Zion, a ready made Phono Stage by the Paradise team
Here is a principle schematic of the output buffer and gain section. It does (for clarity) not show the PSU filters.
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File Type: png Zion Output buffer-driver stage.PNG (50.2 KB, 693 views)
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Old 30th September 2016, 12:20 PM   #29
Joachim Gerhard is offline Joachim Gerhard  Germany
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As i see it has a provision for gain too.
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Old 30th September 2016, 06:36 PM   #30
Louis Wu is offline Louis Wu  United Kingdom
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Quote:
Originally Posted by FdW View Post

The project will be using 4 opamps, and they will be deployed in a technologie that I will call (from now on) "Maximum Amplifier Decoupling" or short MAD(c).
MAD
I am... IN
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