My Take on Threshold NS10

Zen Mod · 2006-02-03 11:30 am

Stabist said:
hehe - I've realized from where my confusion Silly me

Ofcourse - I should be more careful with datasheets where transistor is drawn 3 views (ground plan, side view, ...)
Geee, feel sooooo stupid right now

I always draw notes on paper in my usuall habit-legs to me,face down,if necessary.

hehe-I made mistakes more than once ,before I make that habit

Stabist · 2006-02-03 11:36 am

steenoe said:
Stabist, you are not alone on that one Yes the BC's have different pinout than those on Russ's board.
Happy building.

Steen

Hehe - nice to hear I'm not alone in it

Gee ... I've done a p2p placement of components for stereo NS10 circuitry (but not solder it yet) - man - it's small

Must build similar sized PSU too

Stabist · 2006-02-03 11:40 am

choky said:
I always draw notes on paper in my usuall habit-legs to me,face down,if necessary.

hehe-I made mistakes more than once ,before I make that habit

hehe - the mistake I made was - I've done notes and sketches of placement of components - from top view (and marked legs) - and then opened Philips's datasheet - where ofcourse legs are marked as looking it from bottom; then opened another datasheet (with 3D drawing of transistor) - and ofcourse now I had "different markings" hehe :smash:

hehe ... nice school for next time :angel:

Zen Mod · 2006-02-03 11:46 am

Stabist said:
Must build similar sized PSU too

hehe
you can't
:devilr:

steenoe · 2006-02-03 11:46 am

Must build similar sized PSU too

Are you going for the shunt reg? I hope you are indeed, just to see if it works for somebody else. (I had a little trouble with buzz as you remember if you read the whole thread :xeye:

) You can keep a shunt reg pretty small as you can see on the pics I posted earlier. The sound of it is just great

Steen

Zen Mod · 2006-02-03 11:54 am

just half
not tried yet
series reg part (left part from dotted line) shared between channels
317 CCS and shunt for each channel on chared pcb (reg+audio)

edit- 50mA per stage

Zen Mod · 2006-02-03 11:59 am

steenoe said:
Are you going for the shunt reg? I hope you are indeed, just to see if it works for somebody else. (I had a little trouble with buzz as you remember if you read the whole thread ) You can keep a shunt reg pretty small as you can see on the pics I posted earlier. The sound of it is just great

Steen

lalalalalala........
I don't have buzzzzzzzz
lalalalalala.......
:dead:

steenoe · 2006-02-03 12:23 pm

just half

Did you calculate the resistor values for the 431 device? I am also curious how you would connect that device to the negative side.

Steen

Stabist · 2006-02-03 12:30 pm

choky said:
hehe
you can't

Hehe - do you wanna bet :devilr:

steenoe said:
Are you going for the shunt reg? I hope you are indeed, just to see if it works for somebody else. (I had a little trouble with buzz as you remember if you read the whole thread ) You can keep a shunt reg pretty small as you can see on the pics I posted earlier. The sound of it is just great

I'll try it out with shunt reg probably in next version/attempt - because right now what I have at hand is a bunch of LM317/337 ...

Which schematic did you use for your regulator?

choky said:
just half
not tried yet
series reg part (left part from dotted line) shared between channels
317 CCS and shunt for each channel on chared pcb (reg+audio)

edit- 50mA per stage

Hmm - as a start I wanted to build similar version as your series reg part (double series regulator) with additional power resistors at the output to have constant load ...
but now - this seems tempty

(but I'll have to buy some parts ...)

Btw - trimer - if decided not to use it - do I just simply connect emittor of Q1 directly to -V?

steenoe · 2006-02-03 12:48 pm

Which schematic did you use for your regulator?

I used this except I didnt use darlingtons (yet) I used BD139/BD140, and didnt use the diodes at the output. I tried with more capacitance also (2200uf's) and some other variations.

http://www.diyaudio.com/forums/showthread.php?postid=794628#post794628

If Choky's doesnt buzz, maybe its my perfboard thats bad

I better get some new ones

Here is a pic:
http://www.diyaudio.com/forums/showthread.php?postid=785841#post785841

Steen

Zen Mod · 2006-02-03 4:04 pm

steenoe said:
Did you calculate the resistor values for the 431 device? I am also curious how you would connect that device to the negative side.

Steen

didn't calculated yet resistors

connecting?
like zenner-
exactly the same,just final resistor chaaaaaaaange place

:Popworm:

tip for steen:
minus is always minus
plus is always plus

what you'll call ground
that's your choice
if you are good at it
components will agree with your choice
:devilr:

mods!
where's mine "reinventing the wheel" smiley??

steenoe · 2006-02-03 6:00 pm

tip for steen:

Thats the kind of guidance I need allright

I fiddled with the neg rail and the 431 device with no luck

Steen

steenoe · 2006-02-03 8:17 pm

connecting?

I would like to see a working schematic

I did connect the 431 as you say is the obvious way, but but but.......
Well, I want to discuss the main supply a little more. I just went through some boxes of (big surprise!!) electronic stuff and found this. Take a look at the pic. Isnt that a mains filter of some sort?
Could I try that in front of the trafo? Ofcourse I could try, I know that

But would it be reasonable?? Any chance it would cancel out the darn buzz??

Steen

steenoe · 2006-02-03 8:19 pm

Here is another from the rearside. As you can see on the tracks, it was made for heavy duty

I would appreciate it if someone could tune in on this.

Steen

Zen Mod · 2006-02-03 9:59 pm

steenoe said:
Here is another from the rearside. As you can see on the tracks, it was made for heavy duty I would appreciate it if someone could tune in on this.

Steen

bingo!

nice one
side with three legs- one is line,middle is ground,other side is neutral (in my country line and neutral are interchangeable,meaning that wall outlets and device plugs are not .....hm...phased-if that is proper word.

other side-with two legs -is output to load ;one line,other neutral

try it,immediately

tomorrow I'll try to fiddle with negative 431 and post
in a meantime ,one example
:
http://www.diyaudio.com/forums/attachment.php?s=&postid=766245&stamp=1131941055

steenoe · 2006-02-03 10:10 pm

try it,immediately

Thanks Choky

I thought this little circuit would come in handy some day

I will give it a shot

I just love the simplicity of the shunt reg. Its kind of in the NP-spirit. Sooo the more complicated versions isnt excactly my kind of stuff!

Steen

analogair · 2006-02-03 10:34 pm

Jep, it's a Mains Filter.

steenoe · 2006-02-03 10:42 pm

Jep, it's a Mains Filter.

Thanks Analogair

Nice to have validation on this! I can see its a CLC filter of some sort, with the L's having a (presumably) ironcore! Other than that, I know not a thing about how it works??

Steen

Edit. Now I see, (I think) You edited while I posted

steenoe · 2006-02-03 10:54 pm

Well, Choky as "Papa Apass" said I have always something hiding under my sleeve :smash:

The faces are for Isidora, that little sweet girlie of yours

Steen

Zen Mod · 2006-02-03 11:47 pm

steen
tnx in Isidora's name

if you are in a hurry-you can try this "317 cascode+317CCS+.....) with BD shunt stage instead tl431+mosfet

for my liking,this will be even better

I said -liking,not measuring or listening

My Take on Threshold NS10

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