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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

AKSA's Lender Preamp with 40Vpp Output
AKSA's Lender Preamp with 40Vpp Output
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Old 5th January 2019, 06:40 PM   #981
maty tinman is offline maty tinman  Spain
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But carbon/graphite... coated is to > 100 Mhz. In audio, the problem is usually the RF, aka < 1 Mhz.

It is like ferrites, cheap and generic, work only > 1 Mhz. OK with video band but unuseful with audio band.

Würth has an expensive ferrites that attenuates > 150 kHz. I have a lot, which attenuate half of the Schaffner RF/EMI FN9244B filters.

If two filters is too much, I try with one filter and the Würth 150 kHz ferrite. With my Marantz, in the chain: two filters and one ferrite.
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Last edited by maty tinman; 5th January 2019 at 06:48 PM.
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Old 5th January 2019, 06:59 PM   #982
maty tinman is offline maty tinman  Spain
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In Tarragona we have two active nuclear reactors at 80 Km. A BIG petro-chemical pole, I think is the second biggest in the Mediterranean, at 5 Km. And a great theme park at 10 Km. I believe that the problem in the electrical grid is for these last two.

[Catalan] Complex Petroquimic de Tarragona - Viquipedia, l'enciclopedia lliure

[Big IMG] https://upload.wikimedia.org/wikiped...a_nocturna.jpg


[Big IMG] http://2.bp.blogspot.com/-b5xU1yM5YQ...8/s1600/01.jpg
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Last edited by maty tinman; 5th January 2019 at 07:17 PM.
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Old 5th January 2019, 07:34 PM   #983
maty tinman is offline maty tinman  Spain
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Off topic

Quote:
Originally Posted by Skylar88 View Post
I would be interested to know more about that. I have Win10 version 1803 64-bit.
I would need to write a lot to explain all the tweaks.

The problem with OS is that they are commonly used, they do not work only with multimedia. The soft players also have to be configured well, as well as the outputs (ASIO/ASIO4ALL, Kernel Streaming, Wasapi... ).

The BIG problem in ALL computers is like the CPU works with the internal registers and the data in the HDD/SD. It is not just a matter of priorities in processes, execution, I /O, memory ... is too how the CLOCK is managed!

The CPU generates a lot of noise, jitter or whatever, making the sound has "digititis", digital glare, losing naturalness, credibility, 3D, analogue sound... which are the symptoms that are associated with jitter.

It is a problematic issue. I decided to verify for myself if what others said was true, and that is the way it is. I think nobody has measured it yet, or I have not heard.

Now I get excited more times and more intensely, which for me is proof enough.
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Last edited by maty tinman; 5th January 2019 at 07:38 PM.
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Old 9th January 2019, 11:02 AM   #984
AKSA is offline AKSA  Australia
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Hi Maty

Thank you for your questions - I have just returned from Perth, 2750 kms and my arms are tired!
24 steps 50k SA and the entire case is 3mm CN Am folded.
Good health in 2019 for you and your family.

Hugh
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Old 9th January 2019, 02:02 PM   #985
maty tinman is offline maty tinman  Spain
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And I thought you were in NY.

Compare Attenuator Types

Detailed Information

Quote:
Here is the dB steps chart, which applies to all standard Goldpoint 24-position stepped attenuator values:

Click the image to open in full size.
Quote:
Our off-the-shelf stepped attenuators supply the correct amount of attenuation for most audio systems. But with some systems which have relatively low overall gain, you might have to turn the knob up past the 12 o'clock position to achieve normal listening levels. And some systems with relatively high gain cause the volume level to be too loud after turning the knob up to only the 4th or 5th position. These conditions are easy to remedy, however, as explained below. The graph shows standard and modified stepped attenuator tapers. The blue line is the standard Goldpoint taper.
2 dB by step.

I am used to the 0.5 dB and 1 dB (my Marantz) of digital attenuators.
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Last edited by maty tinman; 9th January 2019 at 02:07 PM.
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Old 9th January 2019, 02:16 PM   #986
maty tinman is offline maty tinman  Spain
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Khozmo, High Quality Audio & Industrial Attenuators and Passive Preamplifiers

Number of steps: 48
Attenuation range: -60 dB ... 0 dB
Attenuation per step: steps 1 to 11 - 2dB, 12 to 48 - 1dB

But $$$, like the expensive DACT.
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Last edited by maty tinman; 9th January 2019 at 02:19 PM.
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Old 9th January 2019, 02:20 PM   #987
maty tinman is offline maty tinman  Spain
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The cheap chinese 21 step DACT:

ericyam | eBay
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Old 9th January 2019, 08:42 PM   #988
maf_au is offline maf_au  Australia
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Is that cheap chinese 21 step DACT ok for the Lender preamp?

Is it better than the 10KOhms potentiometer from the Mouser? Like the (688-RK09L12D0A1W)
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Old 9th January 2019, 09:15 PM   #989
AKSA is offline AKSA  Australia
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Yes it will work fine. I suggest a 20k version as 10k will increase loading on the source.

HD
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Old 9th January 2019, 10:54 PM   #990
maf_au is offline maf_au  Australia
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Thanks AKSA.

Have now ordered the ericyam Chinese version 21 Step with 20k.
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