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Messages - jb

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61
HiFi Audio Equipment Discussion / Re: The power distributor thread
« on: June 14, 2017, 04:57:38 PM »
Nice and detail review of the distributor and also timely for me as I am considering the Furutech GTX-D(R) NCF, and base on review Acoustic Revive is also highly recommend. But I notice that Acoustic Revive is actually using Oyaide R1 with modification to electrode parts to thick silver plating and thick rhodium plating. I have the original Oyaide R1 receptacle and it sound thin... not sure whether can buy this special edition Oyaide R1 to try?




62
HiFi Audio DIY / Re: DIY Wood panel in local Kapit.
« on: May 30, 2017, 12:10:33 PM »
Nicely done wood diffuser, as there are many audiophile user in kuching and Sibu...you should share some of usage of wood diffuser and try your prototype and hear whether the design is good and improve the sound.

63
Solid steel 5.4 audio rack with sand fill for sale at $680, sms at 97852192 if interested (SOLD)


64
Nordost Blue heaven speaker cable for sale at $400 , 3M, bi-wire, banana plug , sms 97852192 if interested




65
HiFi Audio Equipment Discussion / Re: The power conditioning thread
« on: May 17, 2017, 10:12:35 PM »
I can empathy with current generation of audiophiles as not everyone has the technical know how or the time to DIY, so buying branded HIFI is ok as along as put in effort to optimize the sound, anyway music is just a hobby....

With internet, now you can view what other people experiment in other country like diyAudio web has a lot of interesting audio idea to DIY, so don't be constraint to Singapore web site only. I believe if you have try out some good DIY idea and the solution is good and really work well in the system, some users will want to try it and so I hope the information on this site will allow them to experiment it and share their finding.

Example, this power condition staff were not value few years back, but now I see more people paying great attention to clean up their power supply to get the best sound. So the low pass filter you suggest may work for a lot of system, I plan to order a few powered iron core to try out myself...built a few prototype to try out... But I feel if you can design a AC -regeneration power condition is still the way to go...if you have any idea of circuit, please do share it here... I will explore this concept and share if I come across circuit that may work and just try DIY it.

66
HiFi Audio Equipment Discussion / Re: The power conditioning thread
« on: May 16, 2017, 02:34:50 PM »
Thanks for the compliment :) , hope the information will be useful for users that want to try it out...and hope more users will share if they do try the solution so we all gain...

67
HiFi Audio Equipment Discussion / Re: The power conditioning thread
« on: May 15, 2017, 05:58:49 PM »
will do one of this day...
For those who like to DIY the powered iron core inductor, attached is the formula to calculate the inductance and design info... make sure you pick the correct range of iron core...








68
HiFi Audio Equipment Discussion / Re: The power conditioning thread
« on: May 15, 2017, 10:34:00 AM »
For switching power supply design - Hypex smps, I feel you will add more noise to the audio system. If you can think of all transistors and resistors has KTB noise, if you add more of this device to your system, the total system ham & noise spec of amp will be worst off.

69
HiFi Audio Equipment Discussion / Re: The power conditioning thread
« on: May 15, 2017, 10:29:42 AM »
No harm trying just for $3, and can modified the capacitors or inductors to the sound you like... yes , "powered iron cores can typically handle more RF power without saturation than same size ferrite core. Ferrite if driven with large amount of RF power tends to retain its magnetism permanently and this ruin the core by changing its permeability permanently." Actually Aliexpress also sell the powered iron core for about US$2.5 per piece that we can buy and DIY the coil wounding to try out...


https://www.aliexpress.com/item/T200-2-high-frequency-of-carbonyl-iron-powder-core/32271031808.html?spm=2114.01010208.3.1.MloIu1&ws_ab_test=searchweb0_0,searchweb201602_4_10152_10065_10151_10068_436_10136_10137_10157_10060_10138_10155_10062_10156_10154_10056_10055_10054_10059_100032_100033_100031_10099_10103_10102_10096_10147_10052_10053_10050_10107_10142_10051_10084_10083_10080_10082_10081_10110_10175_10111_10112_10113_10114_10181_10183_10182_10185_10078_10079_10073_10123,searchweb201603_9,ppcSwitch_5&btsid=3d2e2f04-1af4-4aee-88fc-8407532ae934&algo_expid=6ddb0ddc-0d3f-4b45-b5ef-34c02b5d14dc-
0&algo_pvid=6ddb0ddc-0d3f-4b45-b5ef-34c02b5d14dc

Another place that you can get powered iron core is amidon corp in USA that makes good quality products, also the cost of core is cheaper, may be have to pay higher postage fee.

http://www.amidoncorp.com/iron-powder-toroids/

70
HiFi Audio Equipment Discussion / Re: The power conditioning thread
« on: May 14, 2017, 04:47:07 PM »
The AC noise filter only cost US$3 that you can order from Aliexpress to try it out... see attached info

71
HiFi Audio Equipment Discussion / Re: The power conditioning thread
« on: May 14, 2017, 04:37:11 PM »
actual AC line filter sell by R&S... as attached
Also the advantage of using common mode choke instead of two inductors  have better common mode noise rejection.

72
HiFi Audio Equipment Discussion / Re: The power conditioning thread
« on: May 14, 2017, 04:24:24 PM »
I think what Lucas shown below is a balance transformer design with some noise filtering circuit and not Risch filter.

But I think there are actual commerical type of similar "Risch" filter that are manufacturing by big cooperation that we can try it for our audio application, I believe you will get similar performance as Risch filter...as is similar circuit and design...
as shown below....some built into IEC connector which is very convient. Of course all this can only use for low current application like CDP, DAC, pre-amp type..



73
HiFi Audio Equipment Discussion / Re: The power conditioning thread
« on: May 12, 2017, 05:16:02 PM »
It could be due to impedance mismatch, as when I simulated with higher filter output impedance to cause a impedance mismatch... the frequency response is no longer a smooth low pass filter response and have high overshoot at -3dB cut off frequency point. See frequency plot.... so you have to experiment and see whether the filter response is as simulated if you have instrument to measure it. Also you will notice that the filter phase change is very sharp at the cut off frequency point... this is not good for audio sound! the phase change should be gradually!

By loading with 100W light bulb, you effectively lower the filter impedance as light bulb resistance should be very low...


74
HiFi Audio Equipment Discussion / Re: The power conditioning thread
« on: May 12, 2017, 04:05:02 PM »
I re-simulated with a 10A current source at 240V. The filter response is similar with only slight shift of the -3dB cut off frequency. This is a cheap and good AC line filter...


75
HiFi Audio Equipment Discussion / Re: The power conditioning thread
« on: May 12, 2017, 10:46:04 AM »
Jon Risch AC line filter frequency plot:


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