No NFB line amp (GainWire mk2)

[dadod]

OK now this is list of interested persons:


pandamiecki
mcd99uk
manso --probably
spind 1(2)
RCruz 1(2)
CafeNoir 1

BR Damir

 

[dadod]

Very interested in one board too.
Since the pcbs will be professionally made, wouldn't it be beneficial to go with a two-layer board?

My intention was to make not to expensive PCB and one-layer is good enough as there no to many jumpers used, and this layout is tested now and there is no hum or broom even with connection as shown here: http://www.diyaudio.com/forums/solid-state/235695-no-nfb-line-amp-gainwire-mk2-24.html#post3797899
BR Damir

 

[vac231]

Hi Damir,

I'm interested in one board!

Best regards,

Nicola

 

[bimo]

Dadod, is it enough to use series regulator?
It is difficult to get mosfet or jfet here.

 

[31697B]

Originally Posted by RNMarsh View Post
How do I get the PCB?


-Richard

Richard you did not send to me PM with your personal email that we can arrange how to send the PCB to you.
BR Damir

Just look me up here at DIYA -- its all there --- 2457 Cascade trail
Cool, CA. 95614
USA

 

[dadod]

Dadod, is it enough to use series regulator?
It is difficult to get mosfet or jfet here.

Yes, but with not so good result and the layout is made for a shunt regulator. I suppose problem for you is DN2540, IRF640/9640 is easy to find everywhere. I have some spare DN2540 and I can send it to you together with the board. Even I can find some 2N5457.

 

[dadod]

Interested persons:

pandamiecki 1
mcd99uk 1
manso --probably
spind 1(2)
RCruz 1(2)
CafeNoir 1
vac231 1

BR Damir

 

[dadod]

Just look me up here at DIYA -- its all there --- 2457 Cascade trail
Cool, CA. 95614
USA

OK Richard, I have two spare board of the first prototype batch with some minor layout faults. I will repair it on one board and send it to you if that is OK with you. I expect that you will do some measurements(THD e.c.) and present results here.
BR Damir

 

[dadod]

Today I've got price information for the PCBs. If I order 10 pcs. min then the price will be 29 Euro with shipping cost included. The board is FR4, 2mm thick 35u copper, silkscreen, and solder mask.
Please tell me if this is OK for you.
BR Damir

 

[padamiecki]

for me OK

 

[mcd99]

Hi Damir,

That is fine for me too.

 

[vac231]

OK for me!

Nicola

 

[arthur]

i m interested for 4 pcbs
thanks

 

[dadod]

Bill Of Materials!

 

[mrsavage]

Interested in four (4) PCB's

Put me down for at least four (4) PCB's. Great work

 

[31697B]

OK Richard, I have two spare board of the first prototype batch with some minor layout faults. I will repair it on one board and send it to you if that is OK with you. I expect that you will do some measurements(THD e.c.) and present results here.
BR Damir

Yes, that would be the plan. SIM vs measured... a confidence builder.

_Richard Marsh
rmarsh@calweb.com

 

[dadod]

This is the list, and OK means agreed with the price of 29 Euro per board.

pandamiecki 1 OK

mcd99uk 1 OK

manso --?

spind 1(2)

RCruz 1(2)

CafeNoir 1

vac231 1 OK

arthur 4 OK

mrsavage 4 OK

 

[AndrewT]

Is this for a stereo board?
Or is it a single channel board?

 

[dadod]

Is this for a stereo board?
Or is it a single channel board?

Stereo board, read this. http://www.diyaudio.com/forums/solid-state/235695-no-nfb-line-amp-gainwire-mk2-25.html#post3799212

 

[Turbon]

Stereo board, read this. http://www.diyaudio.com/forums/solid-state/235695-no-nfb-line-amp-gainwire-mk2-25.html#post3799212

, explains it all...

Regards