Simplistic NJFET RIAA - Page 967 - diyAudio
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Old 16th April 2013, 09:38 PM   #9661
Salas is offline Salas  Greece
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Quote:
Originally Posted by vgeorge View Post
Looks very good Salas!
Maybe you already seen that, but I would put one more hole for the trimmers, a la BIB, in order to accommodate the various pinouts. I like the switchable
input resistors and the tight layout.
Also nice that inputs and outputs are on the back of the board, so to be close on the connectors on the back of the chassis.
Many things are in the details list, also the two type pins trimmers as in the Bib1.1. This is just the vias and general layout has no designations yet.
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Old 16th April 2013, 09:51 PM   #9662
asdiasx is offline asdiasx  Brazil
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Originally Posted by RCruz View Post
I am begining to believe the folded works well with everything we throw at it... no need for fancy caps in the riaa....
I'm curious about that... RCruz, could you point me the folded circuit and values you are using? Maybe this is the one I have to begin with.

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Old 17th April 2013, 07:41 AM   #9663
RCruz is offline RCruz  Switzerland
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Originally Posted by asdiasx View Post
I'm curious about that... RCruz, could you point me the folded circuit and values you are using? Maybe this is the one I have to begin with.
See the circuit and build guide here: Simplistic NJFET RIAA
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Old 17th April 2013, 07:48 AM   #9664
RCruz is offline RCruz  Switzerland
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Quote:
Originally Posted by Salas View Post
Many things are in the details list, also the two type pins trimmers as in the Bib1.1. This is just the vias and general layout has no designations yet.
Can you provide caps sizes ?

I like to use 17mm diameter EL cap and big FT-3 interstage.

Output cap in the shunt could also be slightly larger so I could acomodate a 2.5cm diameter mkp verticaly ?

And one more resistor for the 47k bypass would be very good.

I really like the simetric layout
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Last edited by RCruz; 17th April 2013 at 08:00 AM.
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Old 17th April 2013, 08:02 AM   #9665
RCruz is offline RCruz  Switzerland
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Quote:
Originally Posted by Salas View Post
There is a Y split of different extra cable for dividing the PSU feed in middle pic. Is their ground distance symmetric, is it twisted inside?
Ys, yes, but this is only a test layout... and it works very well indeed.
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Old 17th April 2013, 08:38 AM   #9666
massimo is offline massimo  Italy
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Originally Posted by RCruz View Post
Can you provide caps sizes ?

I like to use 17mm diameter EL cap ....
Worst case scenario (i.e. biggest elcaps) are Elna Silmic II. For the suggested values, diameters are: 1000uF/50V = 18mm and 100uF/50V = 12.5mm
Leds bypass elcap can be smaller, as I do think $$$ Silmic II isn't mandatory here: Pana FC 1000uF/16V is only 10mm, but a footprint of 12.5mm won't hurt IMO.
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Old 17th April 2013, 09:06 AM   #9667
Salas is offline Salas  Greece
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I will list all those details to CRT for when running the final dimensional fixings for the proto.
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Old 17th April 2013, 09:43 AM   #9668
RCruz is offline RCruz  Switzerland
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Cool... I found 2SK369 at Reichelt so my future build will have those
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Old 21st April 2013, 11:25 AM   #9669
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Salas how goes the folded cascode proto?
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Old 21st April 2013, 11:32 AM   #9670
Salas is offline Salas  Greece
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Checking parts dimensions now. Needs little bigger diam lytics to can take Silmic II or Muse, want to add 5mm pads for certain resistors to can be Z Foil also. Various other details.
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