Dx Troyan, a 650 watts channel amplifier. - Page 3 - diyAudio
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Old 21st April 2010, 05:14 PM   #21
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Default This is you can criticise.... it is terrible!..awfull!...ridiculous!

But this is a helpfull hand.... a movement of goodwill..... an intuitive, old style, hand sketch, the board made using pen and paper... an idea..a suggestion, something may help...and... WHAT IS BETTER... people will try to make it better (not difficult to do it better..it is awfull!) and this gonna be good to everybody, including me.

Can you, dear friends.... make better than me?

Errors?....of course there are..always have...humans does that....me human..so..i can do that too.

regards,

Carlos
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Old 21st April 2010, 06:37 PM   #22
a.wayne is offline a.wayne  United States
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Carlos,

É este um amplificador de PA ou para oi-fi?
podemos diminuir a tensão, para não dizer 70 V para 1 ohm operação

que diz respeito
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Old 21st April 2010, 08:59 PM   #23
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Default It is a HiFi audio amplifier, but of course you can use it as Public Adress too

Can operate from 20 volts symetrical supplies or even lower voltages, have only to readjust bias, you can use other transistors when using lower voltages, alike 35 volts..you can use BC557 in the input, you can use BD139/140 as drivers and VAS, you can use TIP41 and TIP42C..... 2N3055 and 2N2955.... MJE3055 and MJE2055..the ones you have, the ones you want.

Reducing voltage you should reduce the CCS current to drivers....also you can reduce electrolitic condensers insulationg voltage, also the quantity of power output devices.

Obrigado por usar a minha lingua...muito gentil de sua parte.

Thank you by the use of my language..this was very kind from you.

regards,

Carlos
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Old 21st April 2010, 10:16 PM   #24
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Default Minimum usefull impedance for Fokker and Troyan is 3.5 ohms

So, it is not good to work using 70V transformers, also not good for 1 ohm load.

I mean, not good to use the old style to connect 70V transformers to distribute audio for several speakers, alike Airport, Restaurant and Hotels..it is a home amplifiers.

Of course can operate using 70 volts symetrical supply.... a very few adjustments may be needed, without replacement of parts.

regards,

Carlos
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Last edited by destroyer X; 21st April 2010 at 10:19 PM.
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Old 22nd April 2010, 10:00 AM   #25
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Default I have already posted the schematic having part numbers on it

was a pdf file published in post .

Here you have once again.

But i think i will change the Darlington Vas to a single transistor VAS... seems sounds better and waveform is also better.

You see the way i use to learn..doing!..... i found two stage VAS better in several amplifier..in this one produces more 3 volts in my output without clip...but only power...the waveform is worse with the darlington VAS...and exactly the opposite compared to our spectations, the old, ancient and not very modern single transistor VAS, in this amplifier, is performing better...i will check this all day long.

And then come the theorists to say the double transistor, naturally other than mine double VAS, sounds better... that a " correct implemented design works fine "...ahahahahahah!.... their designs naturally!... i cannot appreciate them..they go out from the reality... simulator minds they have.... despite can have good intentions and be skilled (have studied a lot of theories and memorized them)..they are enemies of good sound reproduction..as goes believing without test their beliefs.

regards,

Carlos
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File Type: jpg Trojan with part numbers.jpg (464.5 KB, 706 views)
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Last edited by destroyer X; 22nd April 2010 at 10:05 AM.
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Old 22nd April 2010, 10:13 AM   #26
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Default I want to let this clear to the ones land in a thread without read since the first

post... these ones does not know what is going on, and may think i love V/I limiters....when i hate them..... was made to a friend and to the ones likes the stuff...mine was tested and disconnected..the Fokker amplifier has not V/I limiter, also my other amplifiers have not.

You use the way you want..... but build something...or my amplifiers or others, do something usefull for yourself and our communitty..help us to have DIY designs, construction and comments..the way we all like, alike the magazines use to do.... we have too much consultants and reviewers..they are needed...but they are not on topic....the main forum topic is Do It Yourself!

About our thousands of Consultants......some of them, a very few in quantity... thanks God, seems to be undercover critics using their rigth to be in a public forum being nasty and sadistic... pretending that wanna help to bother you officially... and protected by the administration that do not want to see some non obvious offenses not to take the risk to be unfair..this is good...also this is bad.

This makes people alike me...that works for the forum to be feeling bad taste inside the mouth and to think seriously to abandon the forum...alike several others did...and they continue..so the natural selection that will result is not interesting to the forum in the long therm... These last couple of days was peacefull.... let's see what future will bring with the next blitzkrieg.

regards,

Carlos
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Last edited by destroyer X; 22nd April 2010 at 10:28 AM.
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Old 22nd April 2010, 10:34 AM   #27
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Default Sorry, i am feeling myself confused..those last weeks the good into the scope

was good to the listening tests..because these past weeks i was working only with the Dx Blame ST.

But this ones is the opposite...i am watching the waveforms and i can see a little bit better to the darlington VAS... also a little bit more power...more dinamic power..but sound is not so good as the single VAS.

Really.. this confirms old beliefs i have... sadly or gladly as i am confused, because this means we cannot follow rigid rules..sometimes enhanced VAS is better, sometimes not.

My preference is the bootstrap sound...but i will keep the CCS because has an appeal... people loves that tecnocracisms...so, they will aprove and some will assemble...one assembling then i will be paid, as the cost to production was cheap to me.... i had pleasure doing..so...not sweat and tears.... low cost means the need of low payment...one building is enougth to me.

One Brazilian will do first...as usual....because they are simple folks...they do not need new parts or ordered special boards...they use to do using what they have..when others have to order and wait the parts arrival.

regards,

Carlos
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Last edited by destroyer X; 22nd April 2010 at 10:37 AM.
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Old 22nd May 2010, 09:48 AM   #28
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Default The Troyan can operate from 12 volts to 120 volts symetrical

So you will have power going from a very low level, around 25 Watts to 1450 watts rms each channel.

This allows you to assemble with the supply you have and power output transistors will depend the supply voltage, and this will be reflected in the ouput power.

Distortion can be low as 0.004% THD when operating with 100 volts..... go to 0.015% when operating with 120 volts ... so...you can have more than 900 watts each channel with a very low distortion.

It is using CCS to the differential, CCS to the VAS, using darlington VAS and using CCS to the drivers, one CCS to each one of them.

This turns the amplifier a monster of power, delivering enormous peaks of current, that will drive your speakers (I hope you have more than one) to maximum excursion, not matter how hard they are to move.

This amplifiers was assemble and playing for a long time... it is stable and produces amazing sound... 20 kilos speaker enclosures, even having rubber feet, is moving in my room, so huge is the speaker vibration in high power.

This the real "Universal" amplifier...because can work with the supply you have, the supply you found, the supply you like.

CCS to drivers was used in Electrocompaniet amplifiers... what does?... makes bass punch huge, more controlled and reduces distortion.

To be released July, 17 .... for a while two guys are preparing boards layout... Sakis and Metal.

I will accept others producing boards too...no more Dx Corporation main layout designer..because when the main designer resigned..the Corporation almost stops operation.

regards,

Carlos
Attached Images
File Type: jpg Troyar CCS.jpg (271.8 KB, 563 views)
File Type: jpg 1425 watts in 4 ohms to each channel.jpg (276.3 KB, 512 views)
Attached Files
File Type: pdf Troyan - 10 output pairs.pdf (110.0 KB, 265 views)
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Old 22nd May 2010, 09:59 AM   #29
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Wink Nice

Nice work Carlos.

As Usual.
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Old 22nd May 2010, 10:19 AM   #30
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Default Thank you Sami.

regards,

Carlos
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