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Old 21st November 2009, 03:25 AM   #6551
lgreen is offline lgreen  United States
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Carlos, that is a nice looking scope picture; seems like the functinon generator is working. Its hard to photo a scope due to its intensity and the surrounding light. I look foward to seeing the amplifiers that are about to be issued by the DX corp. Are you going to sing through that microphone?
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Old 21st November 2009, 06:27 AM   #6552
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Default That is great.

Congratulations!

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 November 2009, 09:05 AM   #6553
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uncle carlos due to my curiousity to your quasi version i modify the dx amp and made it to your quasi complimentary.
i insert a transistor between R12 and R13. I change Q4 and Q5 to bigger one (A1106 and 2SC2581), my output transistors are 2SC5200 (2 pcs). SUpply voltage is 35-35.
Result is super deep heavy bass, but sonic seems to reduce a little. But i love the bass.
and yes hazing and buzzing sound is there, specially in tweeter.
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Old 21st November 2009, 09:17 AM   #6554
Gyuri is offline Gyuri  Hungary
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Kind Károly is my older brother!

You got very beautiful gifts. Although not from me. But I am glad that you are glad very much. And I believe it, these things got to the best place.
And it, that this story a little gives back my faith damaged slightly otherwise sowed into the human goodness.
Make use of the components your own and onto our joy.

Gyuri
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Old 21st November 2009, 09:50 AM   #6555
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Default My dear Gyuri....pleasure is mine to know you think on me as a brother

And this is exactly what i am searching in this life.... more and more brothers..good friendship is more important than gold, because you can be wealthy and unhappy if feeling yourself lonely..... lonelyness is one of the most noisy silents we can have in our live....scream inside our heart!

Thank you Gyuri.... i use to feel big emotions when i see that people loves me...this is alike Adrenaline to me...this is what matters.

Well, related the images, you see that my scope image is not fine.... cables are the trouble, also the generator needs some trimming into frequencies and waveform, the sinusoidal has a sharp point, alike a military rifle bullet...this is adjusted internally...maybe a trimmer.

regards,

Carlos
Attached Images
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File Type: jpg Finepix 107.jpg (374.5 KB, 247 views)
File Type: jpg Finepix 118.jpg (519.4 KB, 214 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; 21st November 2009 at 10:03 AM.
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Old 21st November 2009, 10:14 AM   #6556
Gyuri is offline Gyuri  Hungary
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I like you and I respect you because you deserve it.

Gyuri
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Old 21st November 2009, 10:15 AM   #6557
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Default Yep Masterinvi, i have tested this way too...i love quasi complementary, but has not

the audiophile "appeal" .... well, that what i was thinking when i have posted the amplifier first time..then i could see people running to Quasi design, the nice quasi complementary amplifier he made.

I do prefer quasi...no doubts about...but also i love to see people building...well...i thougth that people wanted complementary and never will believe in anything different than that...my mistake...now it is done!

The harshing is because you are having distortions driven by signal...some frequencies starts oscilations but something alike "empathy".... then increase your capacitors, the miller one, install 33pf or 47pf (not more than that)..to the NFB...the second differential transistor base, increase the one you have, install more 10 pf in parallel or substitute to a higher value.

The emitter floating resistance to the drivers must be adjusted, and you may try to have almost the same Vbe into the drivers, compared to the output..this happens also because drivers reach saturation before the output.

If you have not installed, then install the 2n2 capacitor between the 4K7 and the off set trimpot, they are sittuated into the differential long tail.... the free lead goes to ground...not the input lifted ground!, goes to the traditional ground.

If harshing continues, then disconnect the zobel filter, lift one lead from the capacitor or from the resistance...i had that trouble once...do not ask me why.... i do not know..but the cure was to remove zobel filter (almost unbeliavable..we think the filter is there to stabilize...sometimes does the opposite)

Good try... really the bass goes to the stars... the midrange goes mufled and treble use to go harshing while using quasi complementary into the Dx Amplifier, but you can tweak to obtain better results.

Post pictures...i love that!..... not knowing how to post (some people does not know or do not know how to use image editting programs)... send them to me if you want to see them published.

carlos.eugenio1951@yahoo.com

regards, be happy, and stay with us into the Corporation... assemble others, no troubles..you will return to the Dx amplifier..for sure.. unless you build another lovely bootstrapped design.

The picture is the package received having gifts inside..sent by Dudainc, Sakis and Taj...this is internal economic brazilian mail system... 5 days to arrive from brazil extreme to extreme points..even into the Amazon jungle...cheap and good internal mail system..less than 20 dollares and we can sent 15 pounds of things along the country..nothing is damaged here.... please, do not send me parts directly...Brazil customs will capture...this was done througth Luiz Eduardo (Dudainc) that has an Enterprise in the USA.

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; 21st November 2009 at 10:25 AM.
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Old 21st November 2009, 10:38 AM   #6558
Gyuri is offline Gyuri  Hungary
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Dear Károly!

I like it that little one FM-transmitter.
Do you have a some kind of experience with these?
Is it worth its price? It is closed down at us analogous FM transfer, but neither ORION or ReVox my tuners I do not wish to pension off.
I hit it on the net though excellent FM transmitters too, but these most expensive.
A cheaper apparatus like this could be a solution possibly because of this onto the home radio station's role.

Best regards:

Gyuri
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Old 21st November 2009, 10:54 AM   #6559
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Default This one is excelent, great separation, frequency response and carrier stability

I have nothing to criticise..works perfectly..have only to adjust the input level not to saturate... the deviation is perfect..the FM deviation let you listen 15 kilohertz without any trouble..also 20 hertz is audible without losses.

Inside a small home alike mine i can capture the signal, in stereo, almost everywhere inside my home..it is a 100 square meters appartment, 3 sleeping rooms, " L " shape living room, 2 bathrooms and good kitchen and other auxiliary rooms to laundry and so on...a balcony too... a middle class appartment in Brazil...cost is 35000 USD and we use to pay in 25 years long financing agreement with a Federal Bank...hehehehe.. now you know the whole story ..inside this one i can listen everywhere.

When people plays portable radio too loud, i use to plug an USB cable (that works for antenna only, has not the USB function into the computer) to increase my transmitting range and i use to ask people to reduce radio volume when they are playing loud and after 22:00 (10 hours nigth)... range goes to 25 meters...but more than 15 meters you cannot capture stereo anymore, signal goes weak and you cannot make your receiver multiplex circuit active.

I am a Radio Amateur too... 40 years skilled..but now a days no active using radio...only audio now!

It uses two Alkaline batteries, 1.5 volts, size AAA (the smaller ones)

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; 21st November 2009 at 11:00 AM.
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Old 21st November 2009, 10:55 AM   #6560
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Default Help

I got a 2 channel DX amp with sc5200 stuffs and +/-42V rails
It's sound nice for hours, but sometimes, there's a constant 50hz big hum just like the amp is burning. the temp is normal: abt 50-60 deg. I turned off, and back on after some mins, its's OK then.

I checked all the way, find nothing wrong.

Could u pls, give me some clue
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