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Zen -> Cen -> Sen, evolution of a minimalistic IV Converter
Zen -> Cen -> Sen, evolution of a minimalistic IV Converter
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Old 13th August 2020, 04:15 AM   #2141
Alex_twn is offline Alex_twn  Taiwan
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Thanks for the update.
On my side I completed the integration of your modified SEN based on 2SK2145 with a PCM1792A and it works very well.
Those JFET are still available so I have one question for you, why not pursuing in this way with JFETs available?
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Old 13th August 2020, 04:28 AM   #2142
EUVL is offline EUVL  Europe
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Everyone can build a SEN with multiple 2SK2145's in parallel.
So nothing new that needs my attention.


Patrick
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Old 13th August 2020, 03:22 PM   #2143
samoloko is offline samoloko  Bulgaria
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I have pcm1794 based dac using OPA1611 /12
It Is better than NE5534 / 32 but would like very much to see your Implementation with Sen

Quote:
Originally Posted by Alex_twn View Post
Thanks for the update.
On my side I completed the integration of your modified SEN based on 2SK2145 with a PCM1792A and it works very well.
Those JFET are still available so I have one question for you, why not pursuing in this way with JFETs available?
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Old 18th August 2020, 05:35 AM   #2144
Alex_twn is offline Alex_twn  Taiwan
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It is not very complex, I use the SEN principle & schematics and replace the original JFET by 2SK2145 with 2x SK2145 JFET in parallel to accommodate the current delivered by the PCM1794.
It is in the end equivalent to 4x JFET as each 2SK2145 include 2x JFET.
I am using a mono configuration and summing the output of the DAC so the output current is x2 on my side but with a stereo configuration and only 7.8mApp output current, most likely one 2SK2145 is enough per branch (no need to put 2 in parallel).
I have been sorting all the 2SK2145 I have to couple them in the best way. I am using a heatsink to thermally couple them.
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Old 18th August 2020, 06:06 AM   #2145
EUVL is offline EUVL  Europe
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With 7.8mApp current, I would be using 16mA bias at least.
That already means 2x 2SK2145BL in parallel.
But 2SK2145BL, even with 9V across it, dissipates close to 100mW per FET.
Too close to max. allowable dissipation for me.
Which means 4x 2SK2145GR in parallel, with matched Idss.

At least that is what I would do.
But of course you have it working with 2x //.
Which is what counts.


Cheers,
Patrick
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Old 19th August 2020, 01:48 AM   #2146
ggetzoff is offline ggetzoff  United States
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Quote:
Originally Posted by EUVL View Post
After 9 years and 2000+ posts, people are still asking for PCBs.

The bad news is that we have none left, and cannot provide JFET sets.
The good news is that we are working on something new along the line of this :
Zen -> Cen -> Sen, evolution of a minimalistic IV Converter

When proven successful, we shall publish in a new thread.


Thank you for your interest,
Patrick
Patrick,

Thatís great, thanks for the heads up!

Cheers,

Greg
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Old 16th September 2020, 05:10 AM   #2147
Alchamist is offline Alchamist
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Quote:
Originally Posted by EUVL View Post
With 7.8mApp current, I would be using 16mA bias at least.
That already means 2x 2SK2145BL in parallel.
But 2SK2145BL, even with 9V across it, dissipates close to 100mW per FET.
Too close to max. allowable dissipation for me.
Which means 4x 2SK2145GR in parallel, with matched Idss.

At least that is what I would do.
But of course you have it working with 2x //.
Which is what counts.


Cheers,
Patrick

Anybody have SEN circuit with 2SK2145 ? It have Y, GR and BL models.Which one is ideal to make SEN ?

I plan to use it for balanced PCM1704 DAC.

Thank you.
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Old 21st September 2020, 12:38 PM   #2148
EUVL is offline EUVL  Europe
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Quote:
Originally Posted by EUVL View Post
The good news is that we are working on something new along the line of this :
Zen -> Cen -> Sen, evolution of a minimalistic IV Converter

When proven successful, we shall publish in a new thread.
Here you go :
A Simple Discrete Current-Mirror IV Converter, ŗ la AD844


Patrick
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