D1 - JFET I/V Converter

Babowana · 4th August 2006, 01:08 PM

Hi all,

I know we have another D1 I/V thread.
Just want to separate this as D1 "JFET" I/V. . .

I believe PaPa will encourage us with this.
I also invite all of your opinions, advices and contributions with
your own idea or design.

Including the two compensation caps, I am trying to apply the
original component values, except in the area around J310.
I am using J310 as I have many left-over behind my previous
JFET pre project, Krazy.

As you see, this is for the unbalanced output.

I might lower the rail voltages and accordingly scale down other values, later when I actually build.

Will this work. . . ? Thanks for any comment. . .

Babowana · 4th August 2006, 02:06 PM

Ayo. . .

Found one mis-print.
Corrected and marked it in red - i.e. reversed polarity of the electrolytic cap at the bottom.

As the reversed polarity causes unsafe explosion of the cap,
I would like to ask Audiofreak to remove the drawing in post#1.
Thanks.

Nelson Pass · 6th August 2006, 03:26 AM

So then it's time to build, isn't it?

Zen Mod · 6th August 2006, 10:16 AM

Quote:

Originally posted by Nelson Pass
So then it's time to build, isn't it?

sweet 'n' shorrrrrrrrt

Babowana · 7th August 2006, 02:45 AM

Thanks, Pa Pa, for the positive comment.

. . .
I do not know when . . .
Our customers ask tech meetings on Saturday and Sunday . . .

Babowana · 4th December 2006, 12:28 PM

To build this, I wanted to see inside of my CD-player
Hek! found that the output of DAC was voltage, not current

What should I do? Still can go ahead?

Gasho · 4th December 2006, 12:31 PM

What DAC chip is in your player?

Babowana · 4th December 2006, 01:05 PM

Quote:

Originally posted by Gasho

What DAC chip is in your player?

PCM1732

Buhl · 4th December 2006, 09:09 PM

Looking at the schematics it looks as if this DACchip has no I-out - I dont know if theres anything you can do..... My AD1865 has pins where you can tap the I signal and not send it to the internal opamps - looks like the 1732 does not give you this option.....

Cheers !
Hans

Zen Mod · 4th December 2006, 10:19 PM

Quote:

Originally posted by Babowana
To build this, I wanted to see inside of my CD-player
Hek! found that the output of DAC was voltage, not current

What should I do? Still can go ahead?

buy some older Philips junk
I'm full of them

even if some aren't in my place.....

it's time to have more than few CD players,isn't it?

except if you are in new technologies ,as DVD or something.....

btw-when you'll try toob susy?

4th December 2006, 09:09 PM	#9
Buhl diyAudio Member Join Date: May 2002 Location: Aalborg, Denmark	Looking at the schematics it looks as if this DACchip has no I-out - I dont know if theres anything you can do..... My AD1865 has pins where you can tap the I signal and not send it to the internal opamps - looks like the 1732 does not give you this option..... Cheers ! Hans __________________ "Calculations? We don't need no stinkin calculations! We just make them really big!" Quote: Nelson Pass

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6th August 2006, 03:26 AM	#3
Nelson Pass The one and only Join Date: Mar 2001	So then it's time to build, isn't it?

7th August 2006, 02:45 AM	#5
Babowana Formerly "jh6you". R.I.P. Join Date: Jul 2006	Thanks, Pa Pa, for the positive comment. . . . I do not know when . . . Our customers ask tech meetings on Saturday and Sunday . . .

4th December 2006, 12:28 PM	#6
Babowana Formerly "jh6you". R.I.P. Join Date: Jul 2006	To build this, I wanted to see inside of my CD-player Hek! found that the output of DAC was voltage, not current What should I do? Still can go ahead?

4th December 2006, 12:31 PM	#7
Gasho diyAudio Member Join Date: Nov 2004 Location: Zagreb	What DAC chip is in your player?

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