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Old 5th February 2010, 08:58 AM   #11
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Hey fastvideo,
Why go the opamp autostrada? Instead go for a passive solution with a resistor in the ballpark of 30ohm/DAC together with a FET cascoded(could be folded for DC out) stage.
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Old 5th February 2010, 05:09 PM   #12
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Quote:
What's the reason to use the provided schematic
filtering in first analog stage, good linearity
Quote:
The 1K in series destroys the idea,
resistor is inside feedback loop, dynamic impedanse of this design is 1.5ohm.
From 1541 output to ground also you need capacitor 200-300pf
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Old 19th October 2010, 04:52 PM   #13
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Default OPA861 is good

Quote:
Originally Posted by fastvideo View Post
Any update on this?
Any reason OPA861 is not good with TDA1541?
Any OPA861 working circuit with TDA1541? I have some OPA861 here and would like to test it out.
I have built a Pedja Rogic's AYA II where the opa681 are used for I/V conversion and output buffer. The sound is very good to me.

I have tried various I/V stages for my NOS TDA1541A DAC for years, including passive I/V, AD844, rbroer's discrete circuit, and so on. Among these circuits, Pedja's OPA861 is no doubt the best one to me.
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Old 19th October 2010, 05:02 PM   #14
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Originally Posted by Nazar_lv View Post
low power supply voltage, not super buffer
I don't think the lower power supply (+/- 5V) is an issue here. In my experience, the sound from the OPA861 I/V is dynamic and powerful.
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Old 19th October 2010, 10:04 PM   #15
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Originally Posted by Marlowe View Post
I have built a Pedja Rogic's AYA II where the opa681 are used for I/V conversion and output buffer. The sound is very good to me.

I have tried various I/V stages for my NOS TDA1541A DAC for years, including passive I/V, AD844, rbroer's discrete circuit, and so on. Among these circuits, Pedja's OPA861 is no doubt the best one to me.

Can you post schematic of the OPA861 for I/V conversion and output buffer stage that you are using?
I am very interested to test it out, thanks.
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Old 20th October 2010, 03:28 AM   #16
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I have no right to post the schematic. The same idea is also suggested by Kuei Yang Wang in this thread. Give me a mail if you are interested the detail.
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Old 21st October 2010, 07:49 AM   #17
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Hi Fastvideo,

I found a diagram of the I/V stage that is archived on Pedja's site.

http://www.audialonline.com/html/arc...images/out.gif
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