New Stasis front end

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#24
Thank you, thank you, THANK YOU! :hbeat:

I wrote this a couple of years ago:

Stasis Traps

... so I will definitely build this, but I will have to make the layout fit the mounting-holes and the wiring of my S/150, so it can be a clean swap.

Drilling new holes in this classic is an absolute NO in my opinion! 😛

Guess it's time to try and figure out how to do circuit-board layout. 😱
 
#25
:worship:
Nelson Pass said:
Not too long ago I received a request for some help from an owner of
an old Threshold Stasis amp, whose amp was broken and where some
previous work had left some issues with the circuit board.

As many of you will know, I have lots of time on my hands 😉 and a
sentimental desire to revise old product in light of the wisdom I have
acquired in 50 years.

So.

I revised the circuit, making it more simple, and laying out a circuit board
which should be usable for all known versions with minor adaptation.

Attached are various schematics and graphics and also the gerber files
for the circuit board, which was made my pcbway.com, who will ask
what dimensions are, which is 5.5" x 3.5"

This thread will also serve as the location for asking additional questions
and so on.

:santa2:
Click to expand...
 
#26
Nelson Pass said:
I revised the circuit, making it more simple, and laying out a circuit board
which should be usable for all known versions with minor adaptation.
Click to expand...

Stasis revival 😀 Thank you Mr. Pass :wiz:
Many transistors are available in stock

https://www.mouser.fr/ProductDetail...ha2pyFadujkBBywZDMUAZwqtCoiCpEUnT%2BKJIUMYe4=

https://www.mouser.fr/datasheet/2/408/TTA004B_datasheet_en_20170109-1102732.pdf

the other Toshiba in near future back in stock december 2020 by thousand pcs.

TTC004B,Q Toshiba | Mouser

https://www.mouser.com/datasheet/2/408/TTC004B_datasheet_en_20180223-1102342.pdf

https://www.mouser.com/ProductDetai...hild/KSC2690AYSTU?qs=bfRUmXT2lZiU5sTvxbBu3A==

https://www.mouser.com/datasheet/2/308/KSC2690A-D-1810605.pdf

https://www.mouser.com/ProductDetai...2pyFadui%2BEXR26k20TBfWGjF%2BP0GyaHVFRcxYMvQ=

https://www.mouser.com/datasheet/2/308/KSA1220A-D-1810436.pdf

Cool news :superman:
 
#28
I see all top and bottom traces are doubled except cross traces and Q6, Q7 maybe for safety reasons if mask expose for some reason or damaged.
Mr. Pass what are benefits of doubling top and bottom traces?
Doubling trace thickness with just 1 oz copper?

P.S.: My OCD tells me there are missing top traces from +C to R23 and from C9 to V+ ... 😀
 
#32

Attachments

  • New Stasis FE Layers.png
    New Stasis FE Layers.png
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#34
gary s said:
I still don't understand what you are trying to say - you need to be clearer.
Click to expand...

On the picture from post #32 you can see traces from gerber file Nelson share.
Red color traces are top copper layer.
Green color traces are bottom copper layer.
Orange color are places where top and bottom copper layers match same route.
That means those fully orange traces are doubled from top and bottom.
Board obviously would would work without any doubled trace.
But there could be some interesting trick from Nelson I don't understand reason right now.
There are some logic.
Exception of traces that are double are the ones that cross both top and bottom layers, the ones that go to Q6, Q7 and the one I wrote "missing".
They could be doulbled too but they don't maybe for a reson maybe not.
May be trick have something to do with current go the path of least impedance or maybe it is overanalysis.. 🙄
 
#35
I will also quote another trick from another thread as interesting and kind of relevant.

GRollins said:
P.S.: Quite some while ago in this very thread, Nelson went to great pains to point out that if you put the + and - traces of a balanced signal on opposite sides of the board (or side-by-side) the two phases will be subject to the same magnetic/RF/whatever fields and thus the induced signal will cancel. I don't recall anyone "getting it." The boards I've seen certainly don't use the principle.
Click to expand...
 
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