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Old 13th August 2012, 12:50 PM   #3131
Salas is online now Salas  Greece
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Lookie! I found a spice I had done later on for the original bjt vref reg. Posting open loop Bode here for the record.
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Old 13th August 2012, 01:32 PM   #3132
AndrewT is offline AndrewT  Scotland
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Triode asks a question and I give my thoughts in answering that question?

Why the "stop tinkering" statement?
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Old 13th August 2012, 02:04 PM   #3133
Salas is online now Salas  Greece
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I did not make any statement, I reminded there is the evolution done already in one way, its open source you you do whatever.
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Old 13th August 2012, 02:21 PM   #3134
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by Salas View Post
There is the JFET Vref standard one, the SSHV1 one to make, instead of head scratching revising the initial idea one, although some still find synergistic qualities in it for some circuits and like it as is...
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I did not make any statement, ....
that is your statement!

To me it says "stop tinkering". Is my understanding of english so bad that you meant something else entirely?
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Old 13th August 2012, 02:23 PM   #3135
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Statement in my book is ''don't make changes'' bcs blah blah, recommendation is ''instead'' ''although'' etc.
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Old 16th August 2012, 04:14 AM   #3136
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Default Stacking supply from SSHV1

Hi,

I am wondering if there is some reason I would not be able to stack a tube rectified supply with a SSHV1. The SSHV is working as expected when it is used independently. When testing the tubed supply independently, it also operates as expected. However, when the tubed supply is stacked on top of the SSHV, I am left with what seems to be some kind of short. I have not checked the current in this condition, but the output voltage measures as 0v. The return of the tubed supply is simply connected to the positive output of the SSHV. The SSHV supply return is connected to signal and earth ground, while the tubed supply's return is only connected to the positive terminal of the SSHV. The SSHV output does not have a load on its output, and the tubed supply output is not regulated, its only load is bleeder resistors. I should also note that the raw supply for the SSHV is SS rectified by a UF4007 FWB, and (small first C)LC filter. I'm sure that I am missing something and that someone can shed some light on this. I have stacked supplies before in prototypes, but never with an SSHV and tubed supply like this.

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-Michael Woods
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Old 16th August 2012, 04:27 AM   #3137
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One more detail, which I hope is not the root of this problem. Both of the supplies have their windings from the same transformer. The CT of the tubed supply is actually two identical 95v windings that are connected together.

-MW
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Old 16th August 2012, 12:07 PM   #3138
AndrewT is offline AndrewT  Scotland
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Surely you need to stack two AC windings on the CT main winding.
Add a 4Vac winding on to one side of the 95Vac CT and add a 4Vac winding to the other side of the 95Vac CT. Now you have 103Vac CT to send to the rectifier.

I cannot see how your 4Vac added after the or through the rectifier output can work.
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Old 16th August 2012, 01:06 PM   #3139
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I might need to move this post, because I realized it's really in the wrong thread! Anyway, the 4v supply is just the filament winding for the az1. The 95vac supply ends up being the 120vdc, which I want to stack off of the 295vac winding supply that is 350vdc raw and 300vdc after regulation.

-MW
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Old 29th August 2012, 01:34 AM   #3140
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Hi !
Quick question.

I recently received a set of SSHV2 boards. I'm planning on using them for a phono preamp. It uses 4x C3g tubes, each biased at 18ma.
The documents state the max current is 100ma. I'm assuming this is max CCS current ?
If so, given my load is 72ma, if my CCS is set at 100mA, that leaves with 28mA of shunt current. Is that enough for the board to perform ?

I'm not planning to drop too many volts over the regulator (each tube is loaded by a CCS, so I'll let those drop the voltage). Votlage in will be about 260V.
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