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-   -   DIY D1 I/V STAGE (http://www.diyaudio.com/forums/pass-labs/181449-diy-d1-i-v-stage.html)

merlin el mago 19th January 2011 04:23 PM

DIY D1 I/V STAGE
 
I want to know if i can use this old DIY D1 I/V STAGE schematic for a SE PCM1704 DAC or it's necessary to change something or if needed I am open to use another suggestion

http://www.diyaudio.com/forums/attac...1schematic.jpg

The mosfet must be matched, if yes wich value?

Iloveswan 24th January 2011 10:36 AM

Quote:

Originally Posted by merlin el mago (Post 2439157)
I want to know if i can use this old DIY D1 I/V STAGE schematic for a SE PCM1704 DAC or it's necessary to change something or if needed I am open to use another suggestion

http://www.diyaudio.com/forums/attac...1schematic.jpg

The mosfet must be matched, if yes wich value?

You should raise R2a's value a little bit unless you can accept around 1Vrms output. If you raise R2a's value, you need to change source resistors value accordingly too.

About Mosfet match, it's easy to get a 1% Vgs matched pair from same production batch.

merlin el mago 25th January 2011 09:12 AM

Thank you

merlin el mago 11th March 2011 11:10 AM

Wich power have to be the transformers 25VA per winding or less?

Wich resistors & values exactly have I to change to get 2Vrms?

merlin el mago 11th March 2011 01:08 PM

About Tx I got the information is 50VA, now I only need to know wich resistors & values for 2Vrms?

merlin el mago 11th March 2011 04:05 PM

Quote:

Originally Posted by merlin el mago (Post 2500035)
About Tx I got the information is 50VA, now I only need to know wich resistors & values for 2Vrms?

I think Tx 2x30VAC & 50VA is per channel or is in total?

qusp 12th March 2011 07:28 AM

Quote:

Originally Posted by Iloveswan (Post 2444286)
About Mosfet match, it's easy to get a 1% Vgs matched pair from same production batch.

vgs yes, transconductance not so much

merlin el mago 12th March 2011 05:42 PM

I need to know wich resistors & values for 2Vrms?

Tx 2x30VAC & 50VA is per channel or is in total?

Iloveswan 13th March 2011 05:14 AM

Quote:

Originally Posted by qusp (Post 2500977)
vgs yes, transconductance not so much

Yes. That is always the problem.

merlin el mago 13th March 2011 10:02 AM

Quote:

Originally Posted by merlin el mago (Post 2501403)
I need to know wich resistors & values for 2Vrms?

Tx 2x30VAC & 50VA is per channel or is in total?

Please help.


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