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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 2018, 07:07 AM   #2131
bern is offline bern  Poland
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Join Date: Jul 2010
Quote:
Originally Posted by EUVL View Post
.....

> If so how could I limit the adverse impact?
Add a small degeneration resistor to the source of the higher current and trim the DC voltage to Zero at the current input.
....
Hi,
Please have a look on schematic I added OPTIONAL resistors (gate stoppers and degenerate resistors). Is it correct?
I am going use SEN and 2xPCM1704 in parallel per channel.

Regards,
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Old 13th August 2018, 09:17 AM   #2132
EUVL is offline EUVL  Europe
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Gate stoppers are correct.
Degenration is at the JFET source.
Please google.


Patrick
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Old 13th August 2018, 03:47 PM   #2133
bern is offline bern  Poland
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Quote:
Originally Posted by EUVL View Post
Degenration is at the JFET source.
Stupid me
You wrote before #2126
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Old 14th August 2018, 01:42 AM   #2134
EUVL is offline EUVL  Europe
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Join Date: Oct 2003
Gentlemen (in general and no one in particular),

Many thanks for your interest over the many years; I am truely flattered.
While the SEN / CEN IV look deceptively simple, they are quite complicated to implement and requires good understanding of analogue electronics.
Above all, they require the use of floating power supplies and hence are suspectible to grounding and noise pick-up problems.

If you do not process such skills, I suggest you try something easier for beginners, such as the excellent ZEN IV by Nelson himself.
You will find a lot of details here :
Zen I/V Converter | Pass DIY
Zen I/V Converter

My apologies for not being able to nurse every individual projects to theri successful conclusion.
If you have a technical issue involving the circuit design that has not been addressed before, I am of course interested to know.


Cheers,
Patrick
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Old 20th August 2018, 08:48 PM   #2135
Mario_JR is offline Mario_JR  Brazil
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Location: Sao Paulo
Just got my hands on 2 pair jfet for the CEN. Does anybody have the board to sell or knows where to get it from?
Cheers!
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Old 18th September 2018, 06:34 AM   #2136
donovas is offline donovas  South Korea
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Sorry i dont understand the circuit completely but for one channel of cen, can i use a single 18v transformer? 0v 18v tap transformer, or do i need 9 0 9? Thanks
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Old 18th September 2018, 11:42 AM   #2137
RollE2k is offline RollE2k  Sweden
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Quote:
Originally Posted by donovas View Post
Sorry i dont understand the circuit completely but for one channel of cen, can i use a single 18v transformer? 0v 18v tap transformer, or do i need 9 0 9? Thanks
Doenst matter which one you use, as long as it is floating (ie no ground reference on secondary). But transformers may still possibly give you hum problems with this circuit.
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Old 3rd December 2018, 06:48 PM   #2138
fccn75 is offline fccn75  United States
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Join Date: May 2006
Quote:
Originally Posted by EUVL View Post
JFET current drifts with temperature.
It will drift a lot less when degenerated a lot.
So e.g. if you use 2SK369V and degenrated to 1~2mA, it will be a lot more stable,
then e.g. a 2SK170GR used in the same way.

2Sk209BL or 2SK117BL would also be good choice.


Patrick

What is the recommendation for nulling the offset of a TDA1541 into the SEN where Iout from DAC is unipolor 0 to -4mA?

I've read from other threads using simple resistors 2K2 tied to +5v acting as ccs to source +2mA and using CCS from JFets.

With JFets, is it better to heavily degenerate i.e. 2SK170BL down to 2mA or a BF245A with measured IDSS of 2mA and use at IDSS with slight adjustment at source?

Please excuse the ignorance, I'm trying to understand the concept of which method yields better stability, thanks.
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Old 3rd December 2018, 06:51 PM   #2139
fccn75 is offline fccn75  United States
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Also, if I were to use a J310 (I know it's obsolete) which data sheet shows IDSS from 24-60mA, would this be even better in terms of heavily degeneration for 2mA?
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Old 12th August 2020, 07:18 PM   #2140
EUVL is offline EUVL  Europe
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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
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