DIY D1 I/V STAGE

merlin el mago · 04:27 PM

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

The mosfet must be matched, if yes wich value?

Iloveswan · 24th January 2011, 10:36 AM

Quote:

Originally Posted by merlin el mago

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

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 · 11:14 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

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

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

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

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

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

Please help.

19th January 2011, 04:23 PM	#1
merlin el mago diyAudio Member Join Date: Sep 2009 Location: Catalonia new Europe state	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 The mosfet must be matched, if yes wich value? Last edited by merlin el mago; 19th January 2011 at 04:27 PM.

11th March 2011, 11:10 AM	#4
merlin el mago diyAudio Member Join Date: Sep 2009 Location: Catalonia new Europe state	Wich power have to be the transformers 25VA per winding or less? Wich resistors & values exactly have I to change to get 2Vrms? Last edited by merlin el mago; 11th March 2011 at 11:14 AM.

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25th January 2011, 09:12 AM	#3
merlin el mago diyAudio Member Join Date: Sep 2009 Location: Catalonia new Europe state	Thank you

11th March 2011, 01:08 PM	#5
merlin el mago diyAudio Member Join Date: Sep 2009 Location: Catalonia new Europe state	About Tx I got the information is 50VA, now I only need to know wich resistors & values for 2Vrms?

12th March 2011, 05:42 PM	#8
merlin el mago diyAudio Member Join Date: Sep 2009 Location: Catalonia new Europe state	I need to know wich resistors & values for 2Vrms? Tx 2x30VAC & 50VA is per channel or is in total?