My Take on Threshold NS10

[Russ White]

BTW I am happy to redo the PCB with an even bigger C1 if you like.

 

[apassgear]

Also C2 being an electrolytic isn't excactly my cup of tea. Maybe a Black Gate NP would be in order

Steen

Yes, C2 and C3, unfortunately I don't use BG np's.

But hopefully we will be able to skip output cap if we manage to have a very low drift on the double rail set up, which I doubt though.

C2 will greatlly determine the overall sound signature and balance through the audio spectrum

 

[steenoe]

It would be a nice touch if you could squeeze in a small cap at each rail, say 1000u @ 35V on the board

I think Tony meant 1000uF, could be wrong.
I would like C1 with pin dist 21,5mm but you don't have to redo the board just because of that

Hopefull one of you folks can fill me in.

I intend to make a couple of boards and hopefully stuff them next week. Will keep you posted, ofcourse

Steen

 

[apassgear]

I think Tony meant 1000uF, could be wrong.
I would like C1 with pin dist 21,5mm but you don't have to redo the board just because of that

Steen

That's correct. 1000uf. Specially if we are using only one PSU for both channels.

 

[Russ White]

Ahh ok, I will rework things and post a PIC and see what you all think, then more PDFs.

 

[apassgear]

Ahh ok, I will rework things and post a PIC and see what you all think, then more PDFs.

If you can keep the film bypass better still.

 

[Russ White]

Why don't you all propose some ideas for C2 andC3. So I can keep the rework down.

 

[steenoe]

C2 will greatlly determine the overall sound signature and balance through the audio spectrum

Is there any particular reason for C2 being 22uF, wouldnt 5-10uF be enough?
It would be easier to fit a nice sounding polyprop then.

Steen

Edit.

I would like C1 with pin dist 21,5mm

Its 22,5mm.

 

[apassgear]

Is there any particular reason for C2 being 22uF, wouldnt 5-10uF be enough?
It would be easier to fit a nice sounding polyprop then.

Steen

C2 will have a great impact on the over all sound. Other similar circuits go fron 22 or 47 and up to even 100uf on that position but of course it depends on topology and active devices used. I suspect that it wont do with less than 22, but as always is a matter of testing for the best sound and taste

 

[steenoe]

Thanks for enlightening on that, Tony. Since C2 and C3 are Non polar, what about using two normal electrolytics turning in opposite directions? That way you can make a DIY nonpolar. It would be easier (and cheaper) to use good audio components then. Just a thought

Steen

 

[apassgear]

Uppppps!!!

I was refering to C3 on the FB, sorry.

C2 is the output cap and the size is determined by the amp input impedance. The lower the impedance the bigger the cap. For the F2 you would only need some 2uf i guess. For a more universal type of preamp use 10 or 20uf.

 

[jacco vermeulen]

Uppppps!!!

Thanks, i've been scratching my head and rolling my eyeballs for an hour or so.

 

[BrianDonegan]

Hey Jacco-

Long time, how goes it?

 

[apassgear]

Steen,

Forgot that the F2 uses an input cap so you might as well delete the output cap for that application. BTW, that applies for any amp using an input cap.

 

[steenoe]

Yes, Tony you are right about the F2 I think this little linestage can come in handy for several uses. (If it sounds good ) I consider building one into my headphone amp as one possibility.
What do you think of my suggestion, using two normal electrolytics? Or should we just keep the NP's?

Steen.

 

[apassgear]

Yes, Tony you are right about the F2 I think this little linestage can come in handy for several uses. (If it sounds good ) I consider building one into my headphone amp as one possibility.
What do you think of my suggestion, using two normal electrolytics? Or should we just keep the NP's?

Steen.

Don't think the NS10, as is, has enough power for phones. I guess a push pull type without output cap will be better. I'm sure you will like the F2 for phones

Sure, you can use lytics for C2/C3. I know you use very nice caps on your projects so go ahead and try some. Panasonic's FC comes to mind or other similar quality.

For C2 –output cap- make sure you have some positive bias to the + of the cap.

 

[apassgear]

Sorry Steen, you ment to control your hedphone amp with the NS10, that sounds good jejej.

 

[Russ White]

So, why don't you guys give me some suggestions for lead spacing for C1 C2 and C3.

I will do 5mm PS bypass lytics and keep the film caps too.

Cheers!
Russ

 

[apassgear]

I will do 5mm PS bypass lytics and keep the film caps too.

Cheers!
Russ

That's nice Russ.

What's the spacing for the film leads?

 

[steenoe]

What's the spacing for the film leads?

I suggested up to 21,5mm for C1, with some smaller options too.
Just checked my local supplier and it seem that a 22uF NP cap is 2,5mm, thats a 35v cap. I would like to see an option for C2 and C3 with two sets of holes, for use with normal electrolytics, if it will not confuse matters. (just point the neg's toward each other) If so 2,0mm leg dist.

Steen.

Edit. Forgot, filmcap bypass for C2 and C3.