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Messages - jb

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31
HiFi Audio Equipment Discussion / Re: DC offset in power line
« on: October 09, 2017, 12:10:15 PM »
Found a more details analysis of this...the circuit is lump to an switch circuit with inductor and resistor in series as shown below:
From the final solved equation, the first term is the AC signal with a second term that generate DC signal depend on the condition...




32
HiFi Audio Equipment Discussion / Re: DC offset in power line
« on: October 05, 2017, 03:49:00 PM »
I think the closest to DC offset, is when u have switch big inductive device causing a few cycle of AC transient surge...see attach link... but most of time your AC distributor circuit breaker should be able to protect against such issue.

http://myelectrical.com/notes/entryid/134/dc-component-of-asymmetrical-faults

else if you are advantageous enough, there are few variation of circuit on DIY audio forum that you can try at your own risk!


http://www.diyaudio.com/forums/solid-state/2080-dc-filter.html

33
HiFi Audio Equipment Discussion / Re: DC offset in power line
« on: October 01, 2017, 03:08:35 PM »
If you are talking about DC offset at amp spk output, yes you can measure it using multimeter set to DC range, what ever DC you measured is the DC offset.

But if you are talking about DC offset at AC supply, I don't think such issue exist in AC circuit. The article you attached is giving wrong information to sell the product.
Typical for AC supply, you will have phase lead or lag issue depend on whether you plug in a lot inductive circuit like big motor... that will change the power factor of AC power supply, so some audio product are actually capacitor that you plug into your receptor that will improve this condition.

34
HiFi Audio Equipment Discussion / Re: DC offset in power line
« on: September 29, 2017, 12:50:12 PM »
Not sure about the DC offset on AC...but reading the measurement method is not correct information..as DC offset measured at amp speaker output is due to gain difference of the amp output transistors and usually have a voltage divider circuit to adjust till the DC offset to 0V..but as temperature drift sometime there may be small DC offset of 10 to 100mV but this will not kill your equipment. But I do notice our AC voltage can range from 215 to 248V depend on the time, and if the power supply circuit were not design properly, this may kill it.

35
HifiCafe.SG Lounge / Re: Work/Computer/Hifi Chair
« on: September 19, 2017, 10:01:17 AM »
No sure about the Mongblan chair, but I just ordered a Secretlab Omega gaming and office chair. Price is about $100 more expensive but it look like will provide better support for the back.

https://sg.secretlab.co/products/omega

36
HiFi Audio Equipment Discussion / Re: upgrade of wall plug
« on: September 18, 2017, 10:47:11 PM »
Finally bought the  Furutech GTX-D NCF(R)  to replace the SINW wall outlet.... will report back how the Furutech as compare to SINE after install and listen. Buy from Japan Amazon will get the cheapest price.


37
magnum Dynalab FT101A FM tuner for sale $680, sms 97852192 if interested.


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Audio CD/SACD/LP / Re: Online CD/SACD/LP Stores
« on: August 20, 2017, 05:51:20 PM »
http://www.elusivedisc.com/default.asp

a very good site to find those elusive disc that you try to look for...

39
HiFi Audio Equipment Discussion / Re: KLAV show 2017
« on: August 04, 2017, 12:20:37 PM »
after hifi show, went to a nice neighbors retro cafe...














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HiFi Audio Equipment Discussion / Re: KLAV show 2017
« on: August 04, 2017, 12:17:27 PM »
all other room set up...


















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HiFi Audio Equipment Discussion / Re: KLAV show 2017
« on: August 04, 2017, 12:13:46 PM »
CMY show room...







































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HiFi Audio Equipment Discussion / Re: KLAV show 2017
« on: August 04, 2017, 12:08:48 PM »
PMC room, meet Jo Ki for the first time...






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HiFi Audio Equipment Discussion / Re: KLAV show 2017
« on: August 04, 2017, 12:03:44 PM »
Audio research driving sonus faber, my favourite room...


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HiFi Audio Equipment Discussion / Re: KLAV show 2017
« on: August 04, 2017, 12:01:43 PM »
Raidho room sound also quite good..


45
HiFi Audio Equipment Discussion / Re: KLAV show 2017
« on: August 04, 2017, 11:59:52 AM »
Triangle art room, this room has the best sound for me...


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