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Old 28th April 2008, 07:22 PM   #5011
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Location: Recife - Brasil Northeast
Default Dx Corporation.... "The sweet sonics laboratories"


Enjoy Dx amplifiers...the one with "sweet sonics"

regards all folks.

All you have to do is to assemble...it is free...made for your happyness.

Carlos
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Old 28th April 2008, 09:15 PM   #5012
udailey is offline udailey  United States
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Just finished building my speakers. I have to still veneer to make them pretty, but they work and they are very nice sounding connected to my Harmon Kardon AVR135. Bass is lacking but the speakers are Full Range 4.5" units so bass is not really expected. I just got my Mouser order an hour or so ago so the next few days I will try to complete my build of two power supplys and two HRII to power these speakers. Remember these are for my wife for her birthday so I dont get to do any further listening since she will be home any minute. Tomorrow more work and more listening
I built a version of the FS Fonken for FE127e designed by Dave Dlugos from Plante10. I tried to follow his plans perfectly but one of my measurements went from 4.75" to 6" a difference of 1.25" and added maybe 20% to the volume of the enclosure. I didnt figure it out until point that I thought was not worth going back and fixing unless the sound was bad. So I continued and I really like it. My first DIY speaker build.

Uriah

Nordic, are you building an enclosure for the Precision? Would love to see it when you do. I am sure we will though
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Old 29th April 2008, 08:39 PM   #5013
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Quote:
Originally posted by AKSA
Carlos,

This praise for me and my amps is very nice, but it's absurd. Anyone with some knowledge and a lot of perseverance can build a better amp; engineering qualifications are not required, but it worries me that EEs continue to dominate the field, with their concern to THD, which below a certain level bears little relation to the quality of the sound.

Greg,

That's a VERY nice picture. Altium? Thank you.......

Cheers,

Hugh
Hello Hugh and Carlos

Yes, perseverance and experience, but also some intuitions and I know that you do have that.

There is a lot of engineer who don't have any intuition but just a nice AP distortion analyser and no ears, and they still design costly amp who don't sound alive... At this April Montreal audio show there was a lot of $10,000 up to $200,000 amps who was sounding only as good as my old Radford amp, but at those $K price they should do much better..

Bye

Gaetan
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Old 29th April 2008, 08:44 PM   #5014
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Default Hello Gaetan, those day i was thinking about you


I am glad you are here...following the thread.

I would be very happy to know your progress related your own designs.

Send me a mail with that report when the good moment arrive.

A new workbench picture too...if the Kodak is already fixed.

à bientôt

Carlos
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Old 29th April 2008, 08:47 PM   #5015
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Default Re: Hello Gaetan, those day i was thinking about you

Quote:
Originally posted by destroyer X
I am glad you are here...following the thread.

Will be happy to know your progress related your own designs.

Send me a mail with that report when the good moment arrive.

à bientôt

Carlos
Hello Carlos

I'm a bit much in urgent repairs to my house now, but my amp are now tweak and I did some first preparations, next are to finish a perf board and do more tests.

Bye

Gaetan
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Old 29th April 2008, 08:50 PM   #5016
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Hello

Forgot to say that my digital kodak still bad working, so not very much photos for some time.

Bye

Gaetan
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Old 30th April 2008, 12:29 AM   #5017
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Default uncle Carlos

hi, good morning. i just construct "precsion I", but problem is, its getting too hot about 2mins operate temperature rise to 70deg "C", this will harm the power transistor? what is the maxium temp shound be accepet for this amp? i am using 2sc2922/2sa1216.

thank you.. i will let you know update too.....
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Old 30th April 2008, 12:44 AM   #5018
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Join Date: Mar 2008
Default uncle Carlos

hi, good morning. i just construct "precsion I", but problem is, its getting too hot about 2mins operate temperature rise to 70deg "C", this will harm the power transistor? what is the maxium temp shound be accepet for this amp? i am using 2sc2922/2sa1216.

thank you.. i will let you know update too.....
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Old 30th April 2008, 03:35 AM   #5019
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Default Hello dear Gaetan, i have answered you into a direct mail


Thank you by the informs.

regards,

Carlos
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Old 30th April 2008, 03:40 AM   #5020
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Default Have you used protective resistances in series into the rails to adjust bias?


Is your bias control adjusting properly?

You need to reduce your stand by bias (no signal current)

If your bias trimpot control is not operating, means you have errors into your construction, so, check all parts if correct in place, check board for errors into the soldering side, short circuits, opened circuits and soon you will be smiling.

The amplifier works, the circuit was tested several times, Nico have tested the boards layout and there's no "bug" into the Precision.... mistake made.... resistance with wrong value, or transistor assembled inverted... something alike that.... and this happens a lot.... we are humans...so.... mistakes is something we use to make daily.

Are you having off set into your amplifier?... that voltage, dc voltage, in the order of milivolts, present into the output terminals?

Have you measured the transistors base to emitter voltage... are they having readings from 550 to 620 milivolts?

regards,

Carlos
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