Winfield's 100W DC-10MHz 1000V/us amplifier

[jan.didden]

Yes. I see no output signal except for what looks like noise and possibly some residual of a switching converter.
Is there a signal input? If so, what is it?

Jan

 

[dimitri]

This is not distortion, this is interference from switcher, please read Jan's notes

 

[dianying123]

This is not distortion, this is interference from switcher, please read Jan's notes

How to find notes？

 

[jan.didden]

https://linearaudio.nl/winfield-hills-100w-10mhz-1000vus-amp-70

 

[dianying123]

DC converter is of bad quality and burned out.
I plan to use this solution.
How to find this power supply in the red circle?

 

[jan.didden]

I designed that power supply.
But the DC-DC converter is not 'weak', if it burned out you have a problem in the amp.
Replacing it with something else will not fix the problem.

Jan

 

[dianying123]

I designed that power supply.
But the DC-DC converter is not 'weak', if it burned out you have a problem in the amp.
Replacing it with something else will not fix the problem.

Jan

Thanks for the advice。
I found a patch missing on the reverse side of the board? Must the patch in the red circle be made?

 

[jan.didden]

Yes, do all of the changes mentioned here: https://docs.google.com/document/d/1Msi3JuRKVNsGa9yKPpHD9AH9sX4urQjUuti1efcf5AM/edit

Jan

 

[dianying123]

Thanks for the advice。
I found a patch missing on the reverse side of the board? Must the patch in the red circle be made?
View attachment 1080537

Sorry, can't see the other point of this wire there?

 

[dianying123]

Yes, do all of the changes mentioned here: https://docs.google.com/document/d/1Msi3JuRKVNsGa9yKPpHD9AH9sX4urQjUuti1efcf5AM/edit

Jan

hi jan Can you tell me where the other end of the wire is?

 

[jan.didden]

I'll check it later today. Have to open it up.

Jan

 

[jan.didden]

I don't see anything inside that circle. Are you referring to the mod in the attached pic?

Jan

 

[dianying123]

I don't see anything inside that circle. Are you referring to the mod in the attached pic?

Jan

Yes, the solder joint in the upper left corner of this red line is there?

 

[dianying123]

I don't see anything inside that circle. Are you referring to the mod in the attached pic?

Jan

Is this correct?

 

[Derun]

Hi Jan,

This page is dead. https://docs.google.com/document/d/1Msi3JuRKVNsGa9yKPpHD9AH9sX4urQjUuti1efcf5AM/edit
Can you help us on that?

Thanks.

 

[jan.didden]

Hi Derun,

Yes, that was deleted some time ago from the online storage.
I am travelling now but when I get home next week I'll see if I can find anything locally.
I'll let you know.

Jan

 

[as_audio]

Winfield should also edit post 1 for the missing pictures.

 

[jan.didden]

I am sorry, I can no longer supoport this project, and as far as I know, neither can Winfield.
But he is/was a member here so you can try to contact him.

https://linearaudio.net/winfield-hills-100w-10mhz-1000vus-amp-70

Jan