Destroyer x Amplifier DX HDII version.

[rabbitz]

I though you were having hassles as your number of posts were on the light side.

Thanks.

 

[Nordic]

To put it in perspective it was so long I had to re-enter my password for DIYAUDIO...

The website is back up now...



Sadly it was about as stressfull the first time I made the site...

 

[samsagaz]

Some boards to sale?

 

[Ernesto]

Hi Nordic.
I´m interested in some boards and components.
Please, say me when you will have complete a new group buy, or if I should contact to Carlos ?
TIA.

Ernesto.

 

[destroyer X]

The only one provide boards is Nordic

So, hermanos Ernesto and Samsaqas, wait him to return to the forum.

Gracias,

Carlos

 

[destroyer X]

No more Optimus amplifier..increasing bias into the HRII

... and i have increased to 1 ampere, and tested into 2 and 3 amperes too (each rail)

... i found that 1 ampere or higher standby bias does not give us any advantage into sound reproduction.... TESTED!

I found was sligthly mufled into higher bias....also i have found the optimized bias point is around 250 miliamperes (as Nordic said..he was rigth!).

Comparisons made, using two identical amplifiers, same parts and same supply, into a single speaker, gave me this result..instead to adjust your stand by bias to 60 to 100 miliamperes, it is better to increase it to 250 to 300 miliamperes because performance was better than lower bias and higher bias.

So.... Optimus is dead....now we have HRII Optimized!

Be happy folks.

Enjoy Dx Amplifier.... sounding near the perfection.

regards,

Carlos

 

[Francois G]

What happened to Nordic and www.DXamp.com? I checked for the last few days and got a domain management company everytime. Did Nordic not renew his domain? Did he move somewhere elso on the web?

I needed the website for instructions on how to construct my speaker protection kit. If anyone has this information please let us know.


Thanks,
Francois

 

[AndrewT]

Nordic has moved to a new home.
Maybe workload of setting himself up has priority.

 

[rabbitz]

Yeah.... he said he was going to be off the air for a month or so.

 

[dudaindc]

Guys,
I wrote him and understand that everything is fine, but his DSL provider has caused many headaches.
Nordic had no internet access for quite a long time, but he should be back soon.
Cheers!

 

[Adi_007]

hi...I want to build this amplifier but I don't know how powerfull the transformer should be for a stereo amplifier.....can you tell me (sorry for my english, is too late and I am tired)

 

[meanman1964]

For 2 channels and one toroid 500VA at least with one toroid per channel 250 a 300 VA

 

[meanman1964]

I was wondering if there is anyone who can design a PCB layout of this amp with 4 output transistors and their emiter resistors?

 

[Francois G]

I'm not sure I understand the question, but if you wanted a more powerful version of HXII, you might consider building Carlos' big amp design -- the Precision. That is configured for up to 6 output transistors per channel ( 3+ and 3-)

Francois

 

[meanman1964]

I'm not sure I understand the question, but if you wanted a more powerful version of HXII, you might consider building Carlos' big amp design -- the Precision. That is configured for up to 6 output transistors per channel ( 3+ and 3-)

Francois

It isn't to have more power but in that way you could use higher PSU voltage.Normaly you use a 2x26VAC for this amp but when you have more output devices you could use let us say 2x30VAC.Those ones I've right now.About the Precission amp that's the next one I build.

 

[meanman1964]

I was wondering if there is anyone who can design a PCB layout of this amp with 4 output transistors and their emiter resistors?

No one?

 

[udailey]

Been a while since I have been to this thread. For anyone who just hit this thread for the first time you might be interested to know that I have spoken to a few people I highly regard in this forum that have listed this amp as one of their very favorites.
Uriah

 

[destroyer X]

I do not remember very well, but i think Taj has made a 55V version

say, he made the board layout, i am not sure if was tested as had errors first one made.

For sure was published into the long thread, the Dx amplifier thread.

I will search into my backup Dvds to see if i can find the layout.... a very beautifull work mafe by our forum friend Taj.

Also will ask Taj if the one was fixed or not.... soon i will be here with the needed answers.

Thank you Meanman and Udailey, this amplifier model is the most appreciated.

Name is High Resolution II, or HRII, the HDII was an error, a typping error made be Nordic, the one openned the group buy, made the board design and distributed 100 boards spreaded into whole world.

Here the HRII audio sample:

http://www.youtube.com/watch?v=Nr-RwqN8qJM

regards,

Carlos

 

[destroyer X]

Well, the board was not assembled to test, so, may have errors

not guaranteed because that... you should check and fix errors, so, do it if you are skilled enougth.

Taj send me last version, not guaranteed if have error or not.

So, build it under your own risk, the circuit is guaranteed, but the more is not (for a while)...maybe you will fix errors for all of us, a nice contribution to our forum.

If image is not 100 percent, i have the original that is 1.5M size, then write me:

carlos.eugenio1951@yahoo.com

regards,

Carlos

 

[taj]

Dxhrii-55v

Here are two high resolution files; one is only the traces and it has been reversed ready to print for etching; the other is a component layout view (transparent PCB style).

..Todd