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Chipomatic balanced input RIAA
Chipomatic balanced input RIAA
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Old 11th December 2018, 07:27 PM   #21
Salas is offline Salas  Greece
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Chipomatic balanced input RIAA
By the way, 1VRMS FFT at 62dB gain when fed from a Jensen step up transformer, input config is BAL.
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Old 11th December 2018, 07:38 PM   #22
scott wurcer is offline scott wurcer  United States
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but no worries because you can't detect Soviet submarines since 1991 anyway
Funny story, this is where the AD743/745 came from. We visited eight or so customers all with "secret" applications and the marketing guy decided that the market was huge. They were all bidding on the same contract.
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Old 11th December 2018, 07:45 PM   #23
GOR3 is offline GOR3  United States
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We visited eight or so customers all with "secret" applications . . . . They were all bidding on the same contract.
So nine bidders, including Jack Bybee.
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Old 11th December 2018, 07:51 PM   #24
scott wurcer is offline scott wurcer  United States
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So nine bidders, including Jack Bybee.
Jack was probably still chipping cars to get around emissions then.
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Old 11th December 2018, 07:57 PM   #25
The Space Egg Corp is offline The Space Egg Corp  England
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" ... customers all with "secret" applications and the marketing guy decided that the market was huge. "



This is EXACTLY the kinda customers any solder slinger would love to tap into.

Those 'hush hush' Pentagon contacts are worth more than their weight in gold-plated XLR skts.



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Old 11th December 2018, 08:03 PM   #26
Salas is offline Salas  Greece
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Chipomatic balanced input RIAA
Here's 1/F from post 21's config. 12 averages to see deeper. Nice 1/F result no uphill. The mild subsonic curve designed in the DC servo should have helped in this too. Hey, where is my raw input 0.00067% THD at same output level from post 9? Why the SUT interfacing changes that down to 0.00032%? The balanced impedance divider has 43 Ohm Zo. The SUT 4kiloOhm Zo. Scott, can this be cancellation between the SUT THD and the AD8429 or internal better result to it or a better result between the INA and the OPA now that the INA works at 100x source impedance level?
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Old 11th December 2018, 08:26 PM   #27
Salas is offline Salas  Greece
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Chipomatic balanced input RIAA
Lightbulb !

Hmm now that I think of it, it should be due to the EMU having to output 1/10 less signal since the transfo steps it up vs how much it was needed for 1V Chipomatic output when with raw input and same RG.
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Old 11th December 2018, 08:44 PM   #28
The Space Egg Corp is offline The Space Egg Corp  England
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Is it possible you egg-heads can speak with the oDd line-break now & again ? ...

... some of us mooodern chicks are viewing with larger than 640 screens you know !



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Old 11th December 2018, 08:46 PM   #29
Salas is offline Salas  Greece
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Chipomatic balanced input RIAA
The EMU TRACKER is my audio interface box that I run ARTA measurement screens with. 1/F is the noise region below a frequency that noise starts picking up from a pass band average level. All things in nature do that, not only electronics, they go noisier the lower the frequency after a corner point. Other earlier and faster, other later and milder. If you listen to the waves breaking at a seashore although you can hear various pitch swirls the bass noises tend to bunch up and dominate.
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Old 11th December 2018, 09:04 PM   #30
Salas is offline Salas  Greece
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Chipomatic balanced input RIAA
1/F noise can end up too much in a phono given the internal gain goes way up in LF & VLF due to the RIAA curve. So we ought to keep it in check. Else we will hear a boiling rumble especially on big sensitive loudspeakers and closed back headphones.
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