Lynx 3

[dodi_firman]

Dear, Mr. Jan
I had bulid your LYNX 3 amp...

If I use 8 transistor output 5200/1943..with rail voltages +/-65 V 15 Amp traffo..at bias 300mv...

The sound are quite good and so powerfull..but I hear liltle hum at the ouput..no loud but its can be heard at night...

What should I do to remove the hum..? I isolated the main ground form the input with 10/1W R...but still ican hear the hum..

If I Put 8 Tr for the ouput..how many watts output for thats ?.. How I can measure for that..

Thanks...Dodi

 

[Jan Dupont]

Hi Dodi,

I have just read your email and this post here.

Lets take the main issue first: Hum

It would a be a big help, if you can make a drawing of the way you have connected the wires (Supply and Ground) to the PCB.
Hum can be caused by the Power Supply, the Ground wiring and by bad shielding..... Lots of possibillities......

Is your layout the same as the original, or have you made a different layout ?

Edit: Added photo of the original layout

 

[dodi_firman]

LYNX 3

Dear Mr. Jan.

Thanks to repply my email..

I had put away all the wires on the input..and only on min capasitor ground conected to ground via R10Ohm to chasis..

I conected the ground input on the PCB to power supply ground for the opamp and driver near them...because if I dont conenct them the DC Voltages are raise at the output stages...

According on your PCB layout, that ground input are not connected to anywhere..accept the feedback capasitor....

There's mistake on the layout..? I just download form the website in Grebers files...

Thank for your attention...
Dodi

 

[Jan Dupont]

As described to you in my email to you, there are no mistakes in the layout. The Input Gnd is made this way, so you can make the Gnd connection to fit your specific Amp internal connection

 

[peranders]

Jan, good work For curious reasons, I checked your Gerber files in Viewmate but the pads are minimal

I have used also GC-Preview with wierd results.

 

[Jan Dupont]

Hi Peranders and thanks
I'm not sure what you meen with Pad are minimal ??
Here is a view of the bottom copper in viewmate

 

[peranders]

Both my gerber wiever has problems with reading the files. I see now that the unit system seems to be wrong. Maybe I can configure the viewers to fit your files.

 

[Jan Dupont]

I opened a local file on my network disk, and had no problems with unit system......
Maybe I should try to check with the files on my website.
Perhaps they are corrupted in some way ........

Edit: Yes the files online are corrupted
Maybe the zip conversion did it??
I'll put up new files right away

 

[peranders]

It works now.... have you noticed my remark on Jens' pcb layout about the feedback? Your feedback point is a bit unsymmetrial, are you aware of that? You have also a couple of disturbing elements on the way to R120. A microscopic(?) improvement would be to "sniff" the feedback signal just before the inductor and have a clean trace directly to R120 with nothing else connected.

 

[Jan Dupont]

Yes I did notice your remark, and you are right about it being unsymmetrial
I will remember your point when making next layout

 

[Jan Dupont]

Zip-file with Gerber files replaced.....
Seems to be fine now
Sorry for any inconvinience.

 

[peranders]

I checked the files and now it can be read without any hassle. I also upgrade Viewmate to the lastest version... run on my Mac

 

[Jan Dupont]

Thanks for the info, peranders

 

[peranders]

This improvement, if there is any, is easly done if you run a second pcb batch. It's also easy to patch the pcb for those who are interested.

Notice also the menu "My projects" doesn't work properly in Firefox, both Windows and Mac but works alright with IE and Safari.

 

[Jan Dupont]

I know peranders
However I may have some minor other mods, so when time is right, there will be a v3.1

 

[dexter]

jan,

i'm using view mate but still unable to see the copper side correctly.
all tyhe lines are thin.

if you don;t mind,
can you post the pdf file for the board and its layout and
also can you provide a complete schematics?
some resistor don't have any value
there is not any voltage value

many thanks in advance.

 

[Jan Dupont]

dexter;
I have checked the Gerbers again, and see no problems......
Try doing a refresh on the site.

PDF-file can be found here:
http://www.audio-circuit.dk/PDF/LYNX_v3.0_Power_Amp.pdf

 

[peranders]

Dextor, download the latest Viewmate. If you still are having problems, try to use IMPORT -> GUESS

At my place Jan's files work correctly just doing an "import"

 

[Jan Dupont]

Thanks for the check, peranders
I was beginning to get worried, that something really strange was happening......

 

[dexter]

thanks han and peranders.

my mistake, the newer file is fine.

I can read them using guess

Jan,

What're the voltage that you use for the amplifier and driver?

Are you using regulated supply for the driver?

why you don;t put some caps bank near the o/p Tr?

did you make any single side pcb layout?

sorry for asking too much questions.

many thanks for your design.

best rgds,