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Old 1st September 2011, 01:21 PM   #61
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Quote:
Originally Posted by AndrewT View Post
Use enameled copper wire.
Choose between 1.0mm diam and 1.6mm diam.
Find a former of between 10mm and 20mm diameter.
Wind on between 8turns and 20turns ..... <snip>.
Hi Andrew,

Perfect! Thanks for your help on the winding as well as placement wrt. the resistor.

Regards,
Francois
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Old 1st September 2011, 04:21 PM   #62
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Default It is better to avoid resistor inside the coil..let the coil be air core

resistor inside is not a good idea.

regards,

Carlos
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Dx Blame ST with a tube preamp. recorded with Xperia cell phone, https://www.youtube.com/watch?v=Qjs32J0gdj0; https://www.youtube.com/watch?v=nhrZ...vDnDhEpNv_XVxg
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Old 2nd September 2011, 01:05 AM   #63
yjc68 is offline yjc68  China
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I'm sorry to bother you,
My transformer is AC 30V ,connect to DX amp, DC is 37.5V.This is my first problem;

The most serious problem is ,when it working,The R6、R12、R13 a little hot,about 60 ℃,then change them 1/2W watt resistance,The problem still exists. (Static current is 90ma.)



I'm new here,Please help me.
Thanks very much.



【我的甲乙类功放 DX amp 完成----多图】 - 放大器DIY论坛 - HIFIDIY论坛 - Powered by Discuz!
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Old 2nd September 2011, 07:33 AM   #64
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Default What is your amplifier model?

Your forum does not show picture..we have to register and log in to see pictures.

I do not know how to read Chinese languages.... so, unable to register.

People from this forum, that made contact with my amplifiers when and while subscribed to this forum, all them have support and follow up...people that has bough boards from other sources, that have not etched circuit boards by themselves at home, have not support.

There are too many non authorized suppliers of Dx amplifiers, and i do not stimulate nor help this kind of enterprise.

If you are within this condition, then you should find help at your dealer... if not, then send me picture of your home made pcboard and you will have all support.

regards,

Carlos
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Dx Blame ST with a tube preamp. recorded with Xperia cell phone, https://www.youtube.com/watch?v=Qjs32J0gdj0; https://www.youtube.com/watch?v=nhrZ...vDnDhEpNv_XVxg

Last edited by destroyer X; 2nd September 2011 at 07:40 AM.
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Old 2nd September 2011, 09:19 PM   #65
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Default This is a solution when you have the need to insert a series resistor

a very ugly way to do...but works too...i do prefere to put underneath of the board as no one will see the mess.

regards,

Carlos
Attached Images
File Type: jpg Ugly solution.jpg (20.4 KB, 941 views)
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Dx Blame ST with a tube preamp. recorded with Xperia cell phone, https://www.youtube.com/watch?v=Qjs32J0gdj0; https://www.youtube.com/watch?v=nhrZ...vDnDhEpNv_XVxg
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Old 3rd September 2011, 04:37 AM   #66
a.wayne is offline a.wayne  United States
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Good uncle Charlie ... pretty soon we dance ................


Sergio Mendes + Brasil 66 - MAS QUE NADA - In Stereo! - YouTube
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Old 3rd September 2011, 10:18 AM   #67
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by destroyer X View Post
a very ugly way to do...but works too...i do prefer to put underneath of the board as no one will see the mess.
This is the ugly solution I offered you and the thread a year or so ago and you shot me down in flames for daring to suggest a modification to your PCB/schematic/build.
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Old 4th September 2011, 03:55 PM   #68
a.wayne is offline a.wayne  United States
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Ok, so you are accepting responsibility for this "ugly " solution....
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Old 5th September 2011, 08:19 AM   #69
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Default About iddle current adjustment, the stand by current

Here you have a video about:

Stand by current adjustment ... ajuste da corrente de repouso - YouTube

Thank you Wayne...the music link.... was good to listen once again....i was young when this music was made.

regards,

Carlos
__________________
Dx Blame ST with a tube preamp. recorded with Xperia cell phone, https://www.youtube.com/watch?v=Qjs32J0gdj0; https://www.youtube.com/watch?v=nhrZ...vDnDhEpNv_XVxg
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Old 10th September 2011, 03:08 PM   #70
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Default Be aware boys...you have now a high power amplifier

I was using my 150 watts Philips speaker and i have increased volume too much...power gone to 600 watts RMS and my speaker started to smell bad.... speake's voice coil resistance dropped to 2.9 ohms because of that.

So..... take care of your speakers...use high power driver units or do not increase too much your volume the way i did.

regards,

Carlos
Attached Images
File Type: png Power specifications 1.png (35.1 KB, 785 views)
File Type: jpg Power 2 specification.jpg (139.1 KB, 718 views)
File Type: jpg Second speaker burned, this time was the MKIII Hx.jpg (88.7 KB, 709 views)
__________________
Dx Blame ST with a tube preamp. recorded with Xperia cell phone, https://www.youtube.com/watch?v=Qjs32J0gdj0; https://www.youtube.com/watch?v=nhrZ...vDnDhEpNv_XVxg

Last edited by destroyer X; 10th September 2011 at 03:17 PM.
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