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Old 19th January 2011, 04:23 PM   #1
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Question 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

Click the image to open in full size.

The mosfet must be matched, if yes wich value?

Last edited by merlin el mago; 19th January 2011 at 04:27 PM.
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Old 24th January 2011, 10:36 AM   #2
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Quote:
Originally Posted by merlin el mago View Post
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

Click the image to open in full size.

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.
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Old 25th January 2011, 09:12 AM   #3
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Thank you
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Old 11th March 2011, 11:10 AM   #4
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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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Old 11th March 2011, 01:08 PM   #5
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About Tx I got the information is 50VA, now I only need to know wich resistors & values for 2Vrms?
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Old 11th March 2011, 04:05 PM   #6
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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?
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Old 12th March 2011, 07:28 AM   #7
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Originally Posted by Iloveswan View Post
About Mosfet match, it's easy to get a 1% Vgs matched pair from same production batch.
vgs yes, transconductance not so much
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Old 12th March 2011, 05:42 PM   #8
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I need to know wich resistors & values for 2Vrms?

Tx 2x30VAC & 50VA is per channel or is in total?
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Old 13th March 2011, 05:14 AM   #9
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Originally Posted by qusp View Post
vgs yes, transconductance not so much
Yes. That is always the problem.
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Old 13th March 2011, 10:02 AM   #10
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Originally Posted by merlin el mago View Post
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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