SEN (evaluation kit)
Hi:
1) I am looking to buy SEN (evaluation kit) with or without matched 2SK170BL for PCM1704 DAC. Anybody with an extra or used kit?
2) As I understand I'll need to get eight (8) matched 2SK170BL for SEN I/V. If available match is Idss 6.4 to 9mA, then is there any preference to what Idss they are matched?
3) Is 2SK170BL the final recommendation from EUVL or after so much experience with SEN, now he recommends some other JFETs?
Regards
Hi:
1) I am looking to buy SEN (evaluation kit) with or without matched 2SK170BL for PCM1704 DAC. Anybody with an extra or used kit?
2) As I understand I'll need to get eight (8) matched 2SK170BL for SEN I/V. If available match is Idss 6.4 to 9mA, then is there any preference to what Idss they are matched?
3) Is 2SK170BL the final recommendation from EUVL or after so much experience with SEN, now he recommends some other JFETs?
Regards
You may contact MarkLai by email and see if he has time and stock to supply you.
Time is the biggest problem for all of us right now.
If you use SEN for PCM1704, you will need 4 matched 2SK170BL for each PCM1704 chip (one channel single ended).
Personally I would choose higher Idss.
You can also use one 2SK369V to replace 2x 2SK170BL in parallel.
So for each PCM1704, you need one matched pair of 2SK369V.
Hope it is clear,
Patrick
Time is the biggest problem for all of us right now.
If you use SEN for PCM1704, you will need 4 matched 2SK170BL for each PCM1704 chip (one channel single ended).
Personally I would choose higher Idss.
You can also use one 2SK369V to replace 2x 2SK170BL in parallel.
So for each PCM1704, you need one matched pair of 2SK369V.
Hope it is clear,
Patrick
Thanks Patrick! I understand that I am rather very late to the party. Still, I request all to help me.
2SK369V or 2x 2SK170BL
These questions might have been answered earlier but can someone authoritatively summarize the options and results on choices on JFETs?
1) 2SK170BL
2) 2SK369V
3) LSK389
4) Any other choices?
Which sounds better?
Which measures better?
Issue with thermal tracking?
Issues with Idss matching?
Numbers needed for each PCM1704 chip (one channel single ended)
These questions might have been answered earlier but can someone authoritatively summarize the options and results on choices on JFETs?
1) 2SK170BL
2) 2SK369V
3) LSK389
4) Any other choices?
Which sounds better?
Which measures better?
Issue with thermal tracking?
Issues with Idss matching?
Numbers needed for each PCM1704 chip (one channel single ended)
Last edited:
JFETs numbers
As Patrick wrote above that for each PCM1704 chip;
4 matched 2SK170BL
2 matched 2SK369V
? matched LSK389
As Patrick wrote above that for each PCM1704 chip;
4 matched 2SK170BL
2 matched 2SK369V
? matched LSK389
As far as I remember nobody compared these options and reported the result in this thread. Why don't you do it and report here?
You can of course also just use what you can source most easily 🙂
Late
As said, I am late to the party. I don't have anything to report on. I am looking to buy the evaluation kit as well as best empirically recommended JFETs for PCM1704.
As said, I am late to the party. I don't have anything to report on. I am looking to buy the evaluation kit as well as best empirically recommended JFETs for PCM1704.
If you are not prepared to try things out yourself, as everyone here who built the circuit did, then I am afraid you are at the wrong place.
It is also precisely why we called it an evaluation kit.
Patrick
It is also precisely why we called it an evaluation kit.
Patrick
Perhaps! my last post was confusing. I meant, I don't have an evaluation kit and so far I have been unable to source a kit.
I'll be happy to report back if someone wants to share 🙂 an extra kit with me!
MarkLai will supply you PCBs and heatsinks if you tell him what you want precisely.
ONE SEN IV V2 PCB will serve 2 PCM1704 DAC chips.
Patrick
ONE SEN IV V2 PCB will serve 2 PCM1704 DAC chips.
Patrick
Patrick:
If using around 300-330R i/v resistors would 330uF bipolar electrolytics be enough? And how do i calculate what size i need there? it really becomes a "RC (CR) high pass filter" i take it, but what cutting frequency should i aim for?
If using around 300-330R i/v resistors would 330uF bipolar electrolytics be enough? And how do i calculate what size i need there? it really becomes a "RC (CR) high pass filter" i take it, but what cutting frequency should i aim for?
> but what cutting frequency should i aim for ?
As low as possible. At most 15Hz.
So 330µ 300R is fine.
Patrick
As low as possible. At most 15Hz.
So 330µ 300R is fine.
Patrick
Would you recommend bipolar like Muse ES over known good polarised ones like Silmic II?
Because i can fit either ES 330uF (real 165uF) or silmic ii 220uF on my boards...
Because i can fit either ES 330uF (real 165uF) or silmic ii 220uF on my boards...
It costs you nothing to try both out, right ?
Solder a socket on your PCB and do A-B test, and tell us your findings.
I am using bipolar, and Elna has a bipolar for audio :
http://www.elna.co.jp/en/capacitor/alumi/catalog/pdf/rbd_e.pdf
ELNA RBD (Bi-polarized) : headfishop.com
The film cap in parallel takes over from ~1kHz onwards.
And remember what I said about Kirchoff's Law in the article.
Patrick
Solder a socket on your PCB and do A-B test, and tell us your findings.
I am using bipolar, and Elna has a bipolar for audio :
http://www.elna.co.jp/en/capacitor/alumi/catalog/pdf/rbd_e.pdf
ELNA RBD (Bi-polarized) : headfishop.com
The film cap in parallel takes over from ~1kHz onwards.
And remember what I said about Kirchoff's Law in the article.
Patrick
I already have 4x Silmic II's so i'll order another 4pcs, and also the 330uF muse es.
I'll parallell them with 2.2uF - so they will actually take in as low as around 250Hz. Don't know yet if the 12.5mm caps will fit my boards. 🙂
I'll parallell them with 2.2uF - so they will actually take in as low as around 250Hz. Don't know yet if the 12.5mm caps will fit my boards. 🙂
Many many articles by e.g. John Curl or Walt Jung on choice of capacitors.
Just search.
Patrick
Just search.
Patrick