Dx Precision, finally released... now debugged and better than HRII - diyAudio
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Old 21st December 2007, 08:06 AM   #1
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Default Dx Precision, finally released... now debugged and better than HRII


Here is the machine....enjoy the sonics... superior sonics.

Around 170 watts into 8 ohms

More than 250 watts into 4 ohms

Clear trebles, without excesses.

Deep and controlled bass

Huge dinamics

Silent amplifier, very low noise...almost nothing to ears.

Huge and tested.

Dx Precision II was made also, the new one i cannot show schematic because sold to a local factory..but i can explore too...maybe, finding a partner (Nordic) we will make some of them.

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
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Old 21st December 2007, 08:16 AM   #2
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Default Transistors are 2N5401, 2N5551 into the differential


Also the first VAS transistor.

To VAS output and drivers, use the good ones:

2SC4793 and 2SA1837.

Into the output the Sankens work better, but, the Toshibas 2SC5200 and 2SA1946 can do the job in a confortable way too.

Bias current, stand by current is 60 miliamps

Off set can be adjusted to be lower than 500 microvolts.

Yeah!... smashed High Resolution II, also the Dx Standard and 80 percent of the forum amplifiers.

Construct 5000 dollares quality amplifier paying 200 dollares in parts.

Wanna better one..... have to go to Hugh Dean....he had helped me to design this one.

Thanks Giamie, dear fratello, ... Also Doctor Self because some ideas...and thanks Nordic (help and support) and also Duda (parts).

The input diodes are dangerous....having oscilation cut the damn thing out!

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
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Old 21st December 2007, 08:56 AM   #3
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Hi Carlos,

Marry Christmas and happy holiday to you and your family.

Thanks for sharing.
any change for us to get a pcb layout also

Regards.
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Old 21st December 2007, 09:02 AM   #4
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Default This will depends from Nordic.


In the reality we are focused into the Dx Precision II..... but..maybe he will make boards for this one just released.

This is up to Nordic.... i will not produce boards for this one because working as production line superviser (for 3 weeks only) into the factory that started to produce Precision II.

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
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Old 21st December 2007, 09:24 AM   #5
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wow.... it is glad to hear.... if Nordic will produce this pcb

Please count me in if Nordic want to start Group Buy

Thanks in advance
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Old 21st December 2007, 11:04 AM   #6
Giaime is offline Giaime  Italy
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Very good amplifier, it seems

I will look forward for the PCBs.
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Old 21st December 2007, 11:28 AM   #7
Nordic is offline Nordic  South Africa
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Carlos, hermano, anything is possible if there is enough of a wish for it...
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Old 21st December 2007, 12:12 PM   #8
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Default its about time

to see some real amps ( considering power ha ha ha ) from you carlos!!!!
its a very nice thing to see someone who managed to produce quality reliability with simplicity and afordable cost to procced to biger machine .....

i am going to be one of the first to buy ..... to listen ....and ofcourse to abuse your amp in my small pa application

merry merry xmas to very very creative carlos !!!!!!

thank you carlos
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Old 21st December 2007, 01:04 PM   #9
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Hi Carlos

Nice amp design, I am pretty sure it will have great sound - see you have changed your opinion Self and are using some of his ideas. The better you amp gets the more ideas i see from Self there.Self does not spoonfeed all his knowledge to others, he only points you in the direction; you have to explore. I dont know whether you are aware that he designs comercial amps which are relatively cheap,have won various awards and with great sound for the price.

I view amp design a bit like hugh from aksa does, hormonic content very important (His amps overdo it a little bit, what he calls musical i call a tad of colouration,too sweat; i compare to the live real thing) and make some cash on the side modifying amps and cd players, my favourites are rotels. Relatively cheap, well built with excellent choice of parts that offer quite good sound for the money. They can become magic with some tweaking!!! The less thd and tim the better but always with a close eye on the harmonic content.

The amp i use is a middle of range 12 year old tweaked rotel which i have compared together with a couple of musicians (sister included;piano) to various amps (some big dollar high end) and including a aksa 55 belonging to a friend. This amp simply blows the aksa away, its in a different class. Some simple amps can be made to sound very good indeed, compensation is critical and component choice important.

I have a roughly built dx II, and a hint try 2sa1016k/2sc2362k for ltp and 2sa1406 or 7/2sc3600 or 1 for vas, even on this new design. Compensation can then be tweaked too and this is what hugh and now also you seem to have mastered.
Maybe ill try this one too later, but i have been playing around for last 9 months with a design similar to roender (i got my idea from ad817/ad797) have not fully mastered the sound yet, but have to say folded cascode gives clean fast and powerful sound. Roender has some excellent ideas, his input pair does sound marvillous and probaly his whole design too.

Nice to read your posts always some humor in them. I am portugese too but born bred and educated in same country as "Nordic".


Alex
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Old 21st December 2007, 01:21 PM   #10
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Default Good that many friends have readed the thread.


I am a little busy repairing my car.... so... i will answer you all latter.

regards,

Carlos
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