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.
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.
Regards
See the circuit and build guide here: http://www.diyaudio.com/forums/analogue-source/129126-simplistic-njfet-riaa.html
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 🙂
Last edited:
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.
I will list all those details to CRT for when running the final dimensional fixings for the proto.
Please consider the option for two resistors in parallel for the 47k and the 6k8 on the riaa section.
It would also be good to have provision for two parallel caps on the 15n and the 47n.
I really like the obbligato gold for the 47n.... can it's size be acomodated ?
It would also be good to have provision for two parallel caps on the 15n and the 47n.
I really like the obbligato gold for the 47n.... can it's size be acomodated ?
Last edited:
The 6k8 has one, the 47k will have 5mm extra so another can go under, 15n has a parallel. Other 47n than 1837 or parallel can't fit, it kills the layout. The interstage takes several biggies.
Its trade off between loop area and subjectivity. First stage and passive Riaa should be tightly nit technically. 5mm lead spacing 1% film & foil filter caps are naturals there. PCB is PCB, it has to have some architecture and allows few certain options the most.
Hi Salas, after all Reichelt 369 are all GR so no go.
They hae 2SK363 BL instead..... no noise figures on the pdf and Yfs seems to be even bigger.... could I use those ?
They hae 2SK363 BL instead..... no noise figures on the pdf and Yfs seems to be even bigger.... could I use those ?
The 2sk363BL came yesterday.... could not resist....
Replaced the 3 x k170 by just one k363 in each side.
K363 are 12mA so according to my calculations I got 40.6dB in the first stage and 58.6dB total Gain.
Both boards powered by the full film BiB and my initial impressions are:
Tighter bass in an overall much more cohesive sound picture presentation.... everything becomes more real... piano sounds much more like it 🙂
Leading edges are better defined.... must listen more
Slightly more noisy than the 2 x k170 or the 3 x k170, but noise is less high pitched.
Replaced the 3 x k170 by just one k363 in each side.
K363 are 12mA so according to my calculations I got 40.6dB in the first stage and 58.6dB total Gain.
Both boards powered by the full film BiB and my initial impressions are:
Tighter bass in an overall much more cohesive sound picture presentation.... everything becomes more real... piano sounds much more like it 🙂
Leading edges are better defined.... must listen more
Slightly more noisy than the 2 x k170 or the 3 x k170, but noise is less high pitched.