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Old 7th October 2009, 11:23 AM   #6451
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For a DIY - Newbie like me it is very hard to get into the DIY - business.

Since NORDIC's "shop" (www.dxamp.com) is offline, I decided to etch the PCBs myself. After a lot of time (and some failures) I finally suceeded.

Now I have to drill the holes into the PCBs, but since I only own a 1000 Watt drillhammer I have to buy some suitable equipment.


This morning I read that the layout of the PCBs which I took from Greg's site is not the current one.
In the meanwhile there exists a DXAMP II PCB-layout.

Shall I continue nevertheless continue or wait for Nordic's return?

Best regards from Hamburg/Germany - Rudi_Ratlos
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Old 7th October 2009, 01:03 PM   #6452
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Default Try the HRII file into Greg home pages.

Dx High Resolution II was called HRII to me simple to speak.

We have the Dx Amplifier, also called Dx amp, or Dx Standard.

Also DHR Turbo, and Dx Precision 1, also called Precision 1...also Dx Trust (old style)

High speed Dremmel will burn the hole while drilling...try to reduce the voltage to see if your machine reduce speed...too much fast burn the holes made.

Nordic have disappeared...i am afraid he is not fine..or very sick or worse than that..and this second possibility i do not want even to think about..i want not to believe he passed away.... well, he made a very nice job with boards and several forum folks (around a 100) have build Dx Amplifier using his boards.

regards,

Carlos
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Power supply; ripple, filter, noise, stability and the use of capacitance multiplier... Portuguese and English; https://www.youtube.com/watch?v=sSm0ku1eIgg

Last edited by destroyer X; 7th October 2009 at 01:05 PM.
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Old 7th October 2009, 04:38 PM   #6453
lgreen is offline lgreen  United States
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Default Nordic's boards

While the Nordic website was up I printed out some pages of the DX HR II and I have also scanned them to the web.

These may help (pdf).
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Old 7th October 2009, 06:44 PM   #6454
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Default Thank you very much dear Igreen.... i am happy, Rudi has made boards....heheheh

I feel good!...yeah!...i feel gooooood!

regards,

Carlos

.................................................. ...

There's a video about Igreen into the youtube:
http://www.youtube.com/watch?v=lDUpKZS-47U
Attached Images
File Type: jpg Rudi pcboard.jpg (103.9 KB, 305 views)
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Power supply; ripple, filter, noise, stability and the use of capacitance multiplier... Portuguese and English; https://www.youtube.com/watch?v=sSm0ku1eIgg

Last edited by destroyer X; 7th October 2009 at 06:46 PM.
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Old 7th October 2009, 06:49 PM   #6455
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Default I am building a Bass only Dx Amplifier.... 90 plus 90 volts supply

heheheh..more than 400 watts RMS (8 ohms)....will it Toast during Test?

we gonna see soon.

regards,

Carlos
Attached Images
File Type: jpg Tomorrow i will test.jpg (772.4 KB, 308 views)
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Power supply; ripple, filter, noise, stability and the use of capacitance multiplier... Portuguese and English; https://www.youtube.com/watch?v=sSm0ku1eIgg
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Old 7th October 2009, 08:11 PM   #6456
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Carlos,

play any song of "Blood, Sweat and Tears": for example: "Spinning Wheel (dremel)".
Someting to "slow down my state of mind".

Where can I order 2 pieces of "NPO Ceramic / Silver Mica, 22 pF" according to Greg's "Bill of materials"?

Well: I will find out.

Best regards - Rudi_Ratlos
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Old 7th October 2009, 08:14 PM   #6457
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Default Dear Rudi...there are some connections under the board

there are two wire jumpers...also you have to run a wire from the zobel filter output capacitor to ground...you see the blue one into the image....the big blue one is the zobel filter capacitor.

also other indications are show into the board image..your board picture with something written over.

regards,

Carlos
Attached Images
File Type: jpg Big zobel capacitor.jpg (737.5 KB, 250 views)
File Type: jpg Rudi...connections here.jpg (398.5 KB, 225 views)
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Power supply; ripple, filter, noise, stability and the use of capacitance multiplier... Portuguese and English; https://www.youtube.com/watch?v=sSm0ku1eIgg
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Old 9th October 2009, 05:29 PM   #6458
lycanlk is offline lycanlk  Sri Lanka
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Default I'm thinking of DX with a bass filter

I'm was looking for a subwoofer amplifier a long time back.. Currently I have a simple Sub-Amplifier which is driven by TIP33c and TIP34c. But not that powered like DX for sure. This is an effort to redesign DX amp with a lowpass filter. Still not completed. AS I have mentioned I'm not a good designer and not good at electronics as well but just giving a try to do something that make me happy
lowpass filter is my own creation with help of a lot of web stuff.. it is not tested.. pls do not try it yet.. wanna fine tune the board.. So tired looking at the screen..
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File Type: png DX PCB v1.00.png (45.1 KB, 192 views)
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Old 9th October 2009, 05:36 PM   #6459
lycanlk is offline lycanlk  Sri Lanka
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Default filter...

schematic
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File Type: png lowpass.png (9.0 KB, 116 views)
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Old 9th October 2009, 05:49 PM   #6460
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Default Thank you Lycanlk....nice amplifier and very good low pass active filter

I hope you build and tell us how your unit sounded.

Bora sent me a suggestion to correct off set..... good one.

here is Bora suggestion.

Thank you dear Bora...but this one gave me some troubles to put it to work, i had to change some resistances and reduce current into drivers, also bootstrapp was changes, and also the input differential load resistances were changed..that circuit was not aproved.... i will try the 62 volts version or folks can build the Dx Amplifier, the standard one, or can produce the DHR Turbo, or even the Precision 1.

I am tweaking the Dx Amplifier, to work fine using 62 volts supply... this is under testing..for a while.

regards,

Carlos
Attached Images
File Type: gif Carlos (1).gif (17.7 KB, 115 views)
File Type: jpg Adjusting to 62 volts.jpg (345.9 KB, 116 views)
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Power supply; ripple, filter, noise, stability and the use of capacitance multiplier... Portuguese and English; https://www.youtube.com/watch?v=sSm0ku1eIgg

Last edited by destroyer X; 9th October 2009 at 06:01 PM.
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