The gate voltage depends on the DAC. For example it is at 0V for PCM1704.
You have to judge for your own case, as I have not spent time on your DAC circuit in detail.
If you use an offet voltage you need to change the value of the resistors across caps to make sure they match with the offset.
See the ES9018 implementation (SEN Version 18).
Patrick
You have to judge for your own case, as I have not spent time on your DAC circuit in detail.
If you use an offet voltage you need to change the value of the resistors across caps to make sure they match with the offset.
See the ES9018 implementation (SEN Version 18).
Patrick
I don't see availability for the LSK389B but can get the LSK389C SOIC. With the need for high bias is that presumably still x3? (30mA).
You may use 2x in parallel, but the Zin will be 50% higher.
LSK389B available at :
https://www.micross.com/ecommerce/shop-default.aspx
Patrick
LSK389B available at :
https://www.micross.com/ecommerce/shop-default.aspx
Patrick
Zen -> Cen -> Sen, evolution of a minimalistic IV Converter
Could you post a link to the schematic for the cascoded balanced version that sounded so good?-- I tried to find it but the thread is long. Also are folks still preferring Joachim's PSU?. I noticed that the SEN is supposedly sensitive to PSU mains power supply noise hence the common mode choke, alternatively using a choke filter before a Salas.
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Could you post a link to the schematic for the cascoded balanced version that sounded so good?-- I tried to find it but the thread is long. Also are folks still preferring Joachim's PSU?. I noticed that the SEN is supposedly sensitive to PSU mains power supply noise hence the common mode choke, alternatively using a choke filter before a Salas.
Sent from my iPhone using Tapatalk
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Cascode BF862 with LS832
Fair enough about batteries ... haven't read through but I assume you have a row of switches that go from recharge to supply?
The BF862 is indeed attractive because low noise and low cost/easily available. I recall reading that it is recommended to cascode this. Considering the LS832 as a dual low leakage/capacitance jfet for cascode? The U431 used in this article: http://http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2872042/
Reasonable or better with J111, etc.?
Fair enough about batteries ... haven't read through but I assume you have a row of switches that go from recharge to supply?
The BF862 is indeed attractive because low noise and low cost/easily available. I recall reading that it is recommended to cascode this. Considering the LS832 as a dual low leakage/capacitance jfet for cascode? The U431 used in this article: http://http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2872042/
Reasonable or better with J111, etc.?
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someone tried cen variant with 2sk2013/2sj313, for dacs that benefit from low impedance i/v?
it would be worth the try with ess dacs wouldnt it?
edit: ...or maybe tempco or mismatch would be a problem? 🙁
it would be worth the try with ess dacs wouldnt it?
edit: ...or maybe tempco or mismatch would be a problem? 🙁
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2SK2013/2SJ313 has a positive Vgs and is therefore NOT self biasing.
If you start putting in a bias circuit like Leach you add complication AND distortion.
A high bias, high power SEN can be done using my LU1014 Triode Cell (200mA bias).
But you have much more capacitances to take care of.
Patrick
If you start putting in a bias circuit like Leach you add complication AND distortion.
A high bias, high power SEN can be done using my LU1014 Triode Cell (200mA bias).
But you have much more capacitances to take care of.
Patrick
regarding 2sk2013/2sj313....
are you worried about added Cgs+ bias-divider-resistor network, aside from added complexity, introducing phase distortion?
are you worried about added Cgs+ bias-divider-resistor network, aside from added complexity, introducing phase distortion?
The distortion mechanism is explained in the article.
Free download at Linear Audio's website.
Patrick
Free download at Linear Audio's website.
Patrick
I've read the article as well as the discussion regarding the BF862 which is easily available. I also read where you were testing the coupling caps ... Obbligatos for example are not very expensive ... did you find a significant difference? Obviously some extra room on the PCB but if it is at all better then worth it. Do you do this type of cascode (?Borbely type)? I'm sure these are neophyte questions and this circuit may be totally off, but I'm trying to learn.
Am I on the right track?
does anybody have any TO92 sinks from patrick left, that you are willing to part with? I need the ones for SEN with 4x transistors per sink. (Type 10 Sink).
Regards,
Robert
Regards,
Robert