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Building the ultimate NOS DAC using TDA1541A
Building the ultimate NOS DAC using TDA1541A
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Old Today, 02:19 PM   #6951
koldby is offline koldby  Denmark
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Join Date: Jun 2003
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Quote:
Originally Posted by lcsaszar View Post
Attached my measurements. I/V resistor is 100R, bias resistor is 2k2 from +5V. Graph #1 is soundcard baseline, graph #2 is 1kHz sine 0dBfs. I haven't got any better soundcard at hand.
By the way, you should change your generator frequency, so you can avoid the spurious'es at 1000Hz multiples . I have the same problem with my measurement equipment, and therefore use 1200Hz instead.
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Old Today, 02:20 PM   #6952
lcsaszar is offline lcsaszar  Hungary
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Default THD with 100R I/V and 0dBfs sine

Here is the THD with my not-so-perfect sound card.
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File Type: jpg THD.jpg (129.7 KB, 34 views)
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Old Today, 02:28 PM   #6953
batteryman is offline batteryman  United Kingdom
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Building the ultimate NOS DAC using TDA1541A
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Originally Posted by lcsaszar View Post
Here is the THD with my not-so-perfect sound card.
Excellent result so a thumbs up for the 100Riv resistor.

Are you using any particular type / brand?
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Old Today, 05:48 PM   #6954
rfbrw is offline rfbrw
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Originally Posted by koldby View Post
Ups my fault. It should have been #5279 I referred
to. Here he clearly states, that it is not desirably to keep the +/- 25mV. Distortion rises , yes , but only marginally so.
There is what is said and there is what is done. Post 5530.
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