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.
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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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/wikipe...1280px-Petroquímica_de_Tarragona_nocturna.jpg
[Big IMG] http://2.bp.blogspot.com/-b5xU1yM5YQU/U0e3Gi03jRI/AAAAAAAAA0c/n0_A3GrDec8/s1600/01.jpg
[Catalan] Complex Petroquimic de Tarragona - Viquipedia, l'enciclopedia lliure
[Big IMG] https://upload.wikimedia.org/wikipe...1280px-Petroquímica_de_Tarragona_nocturna.jpg
[Big IMG] http://2.bp.blogspot.com/-b5xU1yM5YQU/U0e3Gi03jRI/AAAAAAAAA0c/n0_A3GrDec8/s1600/01.jpg
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Off topic
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.
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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And I thought you were in NY.
Compare Attenuator Types
Detailed Information
I am used to the 0.5 dB and 1 dB (my Marantz) of digital attenuators.
Compare Attenuator Types
Detailed Information
Here is the dB steps chart, which applies to all standard Goldpoint 24-position stepped attenuator values:
2 dB by step.
I am used to the 0.5 dB and 1 dB (my Marantz) of digital attenuators.
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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 $$$, like the expensive DACT.
Number of steps: 48
Attenuation range: -60 dB ... 0 dB
Attenuation per step: steps 1 to 11 - 2dB, 12 to 48 - 1dB
But $$$, like the expensive DACT.
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Some experienced and respected members on the forum have reported very good feedback on these cheap DACT type attenuators and I now regret not getting one of these.
I don't want to spark a debate on attenuators, but I had bad luck with one of these in my Lender. It made the most horrible scratching sounds when changing gears. Must be something wrong with the mechanics inside.
Hi. Have been busy with other stuff, but some extra components arrived.
Still waiting for some extra resistors, the DACT SMD volume switch, and the box, etc.
Can anyone see if the main board is ok so far? It just needs R141 and the volume switch.
Still waiting on some resistors for the THT boards, and heat sinks.
Have the HP 90W 19V 4.74A AC Power supply from the laptop supply.
Have the DC-DC Boost Converter Step-up 250W 10A 8.5-48V to 10V-50V Power... (hope that is the correct one!)
Still waiting for some extra resistors, the DACT SMD volume switch, and the box, etc.
Can anyone see if the main board is ok so far? It just needs R141 and the volume switch.
Still waiting on some resistors for the THT boards, and heat sinks.
Have the HP 90W 19V 4.74A AC Power supply from the laptop supply.
Have the DC-DC Boost Converter Step-up 250W 10A 8.5-48V to 10V-50V Power... (hope that is the correct one!)
Attachments
Maf_Au,
Beautiful work - very neat! Looks good to me. Make sure you use edge card socket connectors for the DB rather than solder in directly.
Your PSU looks good but 19v laptop supply is overkill probably. A cheap class 2 wall wart transformer from an old WiFi router at 12v and 1000mA will suffice and probably less noisy than laptop supply. Although HP laptop bricks are some of the best and quietest ones around, so should work well.
Beautiful work - very neat! Looks good to me. Make sure you use edge card socket connectors for the DB rather than solder in directly.
Your PSU looks good but 19v laptop supply is overkill probably. A cheap class 2 wall wart transformer from an old WiFi router at 12v and 1000mA will suffice and probably less noisy than laptop supply. Although HP laptop bricks are some of the best and quietest ones around, so should work well.
Maf_au – I agree with X – beautiful work!
I would also advise to use socket connectors on the motherboard for R121 (the pot) for easier connecting to your panel mounted DACT volume switch. I soldered wires from my panel mounted attenuator directly onto the board and regretted that later when I replaced the cheap problematic stepped attenuator with a Bourns pot. Difficult to solder between the caps there.
I would also advise to use socket connectors on the motherboard for R121 (the pot) for easier connecting to your panel mounted DACT volume switch. I soldered wires from my panel mounted attenuator directly onto the board and regretted that later when I replaced the cheap problematic stepped attenuator with a Bourns pot. Difficult to solder between the caps there.