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-   -   Chipomatic balanced input RIAA (https://www.diyaudio.com/forums/analogue-source/331009-chipomatic-balanced-input-riaa.html)

Salas 11th December 2018 06:27 PM

2 Attachment(s)
By the way, 1VRMS FFT at 62dB gain when fed from a Jensen step up transformer, input config is BAL.

scott wurcer 11th December 2018 06:38 PM

Quote:

Originally Posted by Salas (https://www.diyaudio.com/forums/analogue-source/331009-chipomatic-balanced-input-riaa-post5629587.html#post5629587)
but no worries because you can't detect Soviet submarines since 1991 anyway :D

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.

GOR3 11th December 2018 06:45 PM

Quote:

Originally Posted by scott wurcer (https://www.diyaudio.com/forums/analogue-source/331009-chipomatic-balanced-input-riaa-post5629630.html#post5629630)
We visited eight or so customers all with "secret" applications . . . . They were all bidding on the same contract.

So nine bidders, including Jack Bybee.

scott wurcer 11th December 2018 06:51 PM

Quote:

Originally Posted by GOR3 (https://www.diyaudio.com/forums/analogue-source/331009-chipomatic-balanced-input-riaa-post5629638.html#post5629638)
So nine bidders, including Jack Bybee.

Jack was probably still chipping cars to get around emissions then.

The Space Egg Corp 11th December 2018 06:57 PM

.

" ... 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. :o

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



Si. :)

t.S.E.c

.

Salas 11th December 2018 07:03 PM

1 Attachment(s)
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?

Salas 11th December 2018 07:26 PM

!
 
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.

The Space Egg Corp 11th December 2018 07:44 PM

.

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 !



Si.

t.S.E.c

.

Salas 11th December 2018 07:46 PM

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.

Salas 11th December 2018 08:04 PM

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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