XVR1 active crossover, discrete active stage - Page 2

promitheus · 19th July 2002, 11:35 PM

Thanks,
so you mean this is a model for each half ?
I will try to put it in. I hope it works. I am kinda of new to this program.

rtirion · 19th July 2002, 11:44 PM

Yes, it is a model for each half of the 2sk389.

promitheus · 20th July 2002, 12:04 AM

SO I think the model is ok. I used most of the Data for the model you gave me. Some where not used because they were not in the list I filled out.
But the main characteristics from the model where there.
Thanks a lot again.

promitheus · 21st July 2002, 01:49 PM

I did some simulations on the circuit but the bandwidth was dissapointing. the high end roll off started above 20 KHz.
I am not sure if the jFET model is correct or not. I will check this again.
What do your simulations show ?

rtirion · 21st July 2002, 02:24 PM

I have compiled my results.
You could play with C1, but with a cost.

tvi · 21st July 2002, 03:45 PM

Found this the other day, from l'Audiophie magazine and uses the input stage fom the Le Monstre power amp.

Fig 17: Filtre actif 2 voies utilisant deux filtres passifs RC en cassade. Caracteristiques des composants: resistance a 1% tantale, condensateurs cuivre, potentiometres a film plastique, trim 100W <<COSMOS >>, La frequence de compure est aisement determinee a partir de Fc = 1 / 2 p RC Ainsi pour une coupre de 590Hz C= 10nF R = 27kW.

promitheus · 21st July 2002, 03:49 PM

those look like cascaded FET buffers.
Where was it used for?

tvi · 21st July 2002, 04:44 PM

Found it posted at <a href="http://forums.delphiforums.com/n/main.asp?webtag=haute_fidelite&nav=start">le Forum de HAUTE-FIDELITE.net</a>, can't find the thread now.

The original poster said;
"I do not know if it is Kaneda, it is the active filter of the audiophile N°7, new series. With the PSU of Kaneda 50W and the input stage of the Monster 8W for each of 4 cells"

Tanslated the caption for the schematic using <a href="http://trans.voila.fr/?getting_web">Viola
</a>Fig 17: active Filter 2 ways using two passive filters RC there cassade. Caracteristiques constituents(component): copper resistance is 1 % tantale, condensers, potentiometres has plastic film, trim 100W < < COSMOS > >, The frequence of compure is aisement determinee has to leave Fc = 1 /(2 p RC) So for a coupre of 590Hz C = 10nF R = 27kW.

Thought someone might find it of interest?

Regards
James

promitheus · 22nd July 2002, 01:29 AM

tvi would you be interested in making a new thread and designing an all SMD discrete opamp for general use like active crossovers, phono stages, analog DAC outputs and so on ?

21st July 2002, 04:44 PM	#18
tvi diyAudio Member Join Date: Apr 2001 Location: Moonee Ponds, Vic, Australia	Found it posted at <a href="http://forums.delphiforums.com/n/main.asp?webtag=haute_fidelite&nav=start">le Forum de HAUTE-FIDELITE.net</a>, can't find the thread now. The original poster said; <i>"I do not know if it is Kaneda, it is the active filter of the audiophile N°7, new series. With the PSU of Kaneda 50W and the input stage of the Monster 8W for each of 4 cells"</i> Tanslated the caption for the schematic using <a href="http://trans.voila.fr/?getting_web">Viola </a><i>Fig 17: active Filter 2 ways using two passive filters RC there cassade. Caracteristiques constituents(component): copper resistance is 1 % tantale, condensers, potentiometres has plastic film, trim 100<FONT FACE="Symbol">W</FONT> < < COSMOS > >, The frequence of compure is aisement determinee has to leave Fc = 1 /(2 <FONT FACE="Symbol">p</FONT> RC) So for a coupre of 590Hz C = 10nF R = 27k<FONT FACE="Symbol">W</FONT></i>. Thought someone might find it of interest? Regards James

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19th July 2002, 11:35 PM	#11
promitheus diyAudio Member Join Date: Jan 2001 Location: Germany	Thanks, so you mean this is a model for each half ? I will try to put it in. I hope it works. I am kinda of new to this program.

19th July 2002, 11:44 PM	#12
rtirion diyAudio Member Join Date: Nov 2000	Yes, it is a model for each half of the 2sk389.

20th July 2002, 12:04 AM	#13
promitheus diyAudio Member Join Date: Jan 2001 Location: Germany	SO I think the model is ok. I used most of the Data for the model you gave me. Some where not used because they were not in the list I filled out. But the main characteristics from the model where there. Thanks a lot again.

21st July 2002, 01:49 PM	#14
promitheus diyAudio Member Join Date: Jan 2001 Location: Germany	I did some simulations on the circuit but the bandwidth was dissapointing. the high end roll off started above 20 KHz. I am not sure if the jFET model is correct or not. I will check this again. What do your simulations show ?

21st July 2002, 03:49 PM	#17
promitheus diyAudio Member Join Date: Jan 2001 Location: Germany	those look like cascaded FET buffers. Where was it used for?

22nd July 2002, 01:29 AM	#19
promitheus diyAudio Member Join Date: Jan 2001 Location: Germany	tvi would you be interested in making a new thread and designing an all SMD discrete opamp for general use like active crossovers, phono stages, analog DAC outputs and so on ?

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