Dx Troyan, a 650 watts channel amplifier.

[ostripper]

don't be sorry for not being precise in your selection of components. There is no reason to appologise.

But, be unambiguous when you tell your readers what you recommend.

As you can see "match transistors" means something completely different to different people.

"What you put in is what you will receive at the other end" On one amp I did not bother to closely match devices ... amp worked (well ??), but Re voltages were less than ideal ( 15mv , 18mv ,14mv). On newer amp, just using a DMM selected 16 out of 30 devices that were "close" .. now ALL Re's are 15mv I do not think this made the amp sound better but it might be more reliable in the long term.

Just a consideration when building a high powered amplifier with many paralleled pairs.

Input devices also follow this line of thought. If you can find 2 that are "close" with the DMM you will have a output offset of <10mv BEFORE having to adjust a trimmer. This actually MAY influence the final sound .

OS

 

[destroyer X]

I am still playing with the Troyan..now playing with a voltage regulator

Enjoy the video and the picture:

YouTube - Supply, part 3 - Still playing with the regulator

regards,

Carlos

 

[destroyer X]

I have discovered the way to make it sound awsome

Interesting.... a non standard modification that may drive technocrats crazy... well..they will never know..they are not builders.

Now it is playing with astounding, awsome superior sonics.

Will inform only to builders.... to avoid troubles...the modification is really crazy.

aahahahahahah!

regards,

Carlos

 

[norazmi]

hi there,

Uncle Charlie can u send me an email for this construction of troyan, schematics, PCB, silk if u have the final one all of these, i would like to build it now. my email xwebmaster at gmail dot com. THIS IS MONSTER AMP!!

Regards.
Azmi.

 

[norazmi]

for the power supply, ill use offline smps by LUKA, already made 1 and working good, rails can be adjust by rewind trafo, maybe i can get 1kw of this smps, tested with dx amp before working great ..

Regards.
Azmi.

 

[tryonziess]

Carlos,
I am not one of the complainers. Please send me all of your modifications. I think I will put this together. I have about 32 nice 100 volt caps and some nice 1kw trannies.
How much welding cable do you think I will need? Joking here.

I also have some 10 nice Rifa 450 volt oil filled caps if anyone is interested. They are real nice. It takes a slew of bridge rectifiers in parallel to charge them.

Tad

 

[destroyer X]

All i know from this amplifier was posted Azmi....i cannot remember details

So, the effort for you to read will be the same effort for me to read.

Please, give a good read into this thread in advance to move... this amplifier is not easy.

I am very busy with the new amplifiers to be released, so, i will be happy if you do some effort to read, avoiding me to read the thread to remember and then go to explain you.... do not make too much sense if you can read by yourself saving from uncle charlie some effort and also saving my time and energies... as i have already spent a lot creating it, simulating it, building it and testing it..not your turn folks.

I am glad about your interest friends, but this amplifier was posted so long time ago that i cannot remember exactly....reason why i have posted all things that happened.... the thread is the memory for us..... alike you dear Norazmi...i will have to read the thread entirely to understand it deeply... as i said...i'm doing other things...i would like to be free to finish the stuff i have to do.

Modifications are easy, two parts to change..so...first build it..then after built i will inform you what parts to remove and change value.... will not inform in advance..no way.

regards,

Carlos

 

[norazmi]

Sure Uncle Charlie, im reading on it , take ur time first ill carefully build this one as you mention above, hihihi dont worry be happy uncle Charlie

Regards,
Azmi.

 

[Nico Ras]

Adding a Busbar

Carlos,

Congratulations with your new design. I trust that the builders will enjoy this one as much as they did all your previous designs.

I would like to make one recommendation in that you remove the soldermask from the power lines so that the constructor can solder a copper busbar (see attached picture).

I have found this necessary on high power amps laid out this way. as there is a considerable voltage drop across the PCB track from the first to last transistor and you find the first works harder than the last.

Kindest regards

Nico

 

[Nico Ras]

Here is a better view

Nico

 

[Krisfr]

Here is a better view

Nico

What is the bar material?

 

[destroyer X]

Thank you Azmi and Nico Ras

I will inform the layout designer about it.

regards,

Carlos

 

[norazmi]

Here is a better view

Nico

OMG!!! Thats monster Ampppp....

 

[Nico Ras]

What is the bar material?

It is solid copper cut from a sheet 3mm wide x 1.6 mm thick. However some designers would recommend running a star positive and negative supply directly from the capacitors, which I would think is still better, but it does not look very nice.

 

[Nico Ras]

It is simple to apply. I smeared solder paste and then heat it with a small butane gas torch.

 

[tryonziess]

Voltage drop on power trace

Nico,
I have never really given much thought to power trace voltage drop. You definately have something here with a very high output amp. Feeding the power trace in the middle would also be helpful. I will give this some consideration when I start constructing the heatsink and chassis layout
When being fanatical about amplifier projects this is just another nice thing to add in. In differentiation amongst the outputs will show up somewhere.

Thanks Tad

 

[destroyer X]

Not only voltage drop..short circuit may destroy the track

If you make the way he told us...track will survive do 30 amperes or more.

regards,

Carlos

 

[Nico Ras]

Hi Carlos,

in this particular amp I have to pass currents of 56 and more amperes. This can make a hugh difference in powewr dissipation/ It was only a thought. Have you check what is the peak current that you may pass, assuming it is an instantanuous current. Perhaps 10 amps, very probably more?

 

[Nico Ras]

I think it is necessary to divorce the rms current from the peak or music current. This is the erengy that the capacitors can instantanuously dump into the load, not what the transformer is capable of.

 

[Nico Ras]

I had an interesting experience when testing this amp looking for speakers. I asked the salesman what is the most powerful speakers he has for full power testing and he recommended some Rockford fosgates.

I said to him, this is a pretty powerful beast and he confirmed that there is no better speaker available for the job.

I asked him to connect some wires to it and insert it into the ac mains wall outlet - he looked at me as if I was mad. But I told him if they play a good 50Hz note for some time I will take two.

He refused my test and I told him, his speakers will not do the job.