Simplistic NJFET RIAA

[alexkosha]

I finished my box and my PSU is finally "done-deal".
Phono will be dropped into the same style box with VU meters installed into front panel.
I'm waiting for my new DE-5000 capacitor meter to be arrivd from Japan. I need to measure C2 and C2Y tandem and would like to get precisely 15.2nF. All other advised by Salas parts will be drop at the same time to lower my gain a bit.

 

[skouliki]

Beautiful work there Alex.

 

[Salas]

Nezbleu nice progress, Alex very good aesthetics.

 

[alexkosha]

Thank you guys. Folded Phono boxed pictures will come soon too.

 

[alexkosha]

I remember we discussed crimp connection here. Please see attached pictures and let me know if this is what we considered as an optimal way to use wires with screw terminals. I do not want to use WBT ($1 a piece is quite crazy) since min size is 20 AWG with no isolation. I have up to 32 AWG with insulation collar perfect for my RG-174 coax now and all PSU power wires.

 

[Salas]

They look good. But they are hollow throughout? Maybe they can allow some solder to go in from the nose too?

 

[alexkosha]

They look good. But they are hollow throughout? Maybe they can allow some solder to go in from the nose too?

They are tube type (ferrule). Insulator collar can be heated and its shrinks too.
I'm not sure if soldering is needed since crimp tool is press wire inside the tube very tightly. It is soft tin copper material.

 

[Salas]

If you can't pull out the wire without breaking it after crimping then it should need nothing else.

 

[Erlend Sæterdal]

Susumu RG and Vishay TNPW are smd resistors and available from Mouser. Miniohm resistors are a smaller wattage version of Econistor and Squaristor resistors and are available from Rhopoint Components. Some values are stocked in Farnell as well.

Precision (through hole) - Resistors - Components

Edit: You can buy directly from rhopoint components but you have to register an account first and then ask for a quote

Thoose wirewound resistors can cause oscillation. Once I had that problem with a Riaa.

 

[Turbon]

Wouldn't using any kind of terminal add one extra interface vs soldering the cable directly to the board?

 

[Erlend Sæterdal]

Wouldn't using any kind of terminal add one extra interface vs soldering the cable directly to the board?

I never use the terminals. A lot off plastic and magnetic screws.

 

[Salas]

Thoose wirewound resistors can cause oscillation. Once I had that problem with a Riaa.

Not here if not used as gate stoppers. Not in the load and Riaa sections certainly. No loop NFB, no gate stoppers other than in the regs MOSFETs.

 

[RCruz]

I remember we discussed crimp connection here. Please see attached pictures and let me know if this is what we considered as an optimal way to use wires with screw terminals. I do not want to use WBT ($1 a piece is quite crazy) since min size is 20 AWG with no isolation. I have up to 32 AWG with insulation collar perfect for my RG-174 coax now and all PSU power wires.

That is exactly what I use.... perfect

 

[skouliki]

Just read the comments from Erlend about your phono versus the Accuphase beast. Congratulations for your design Salas!
Im also very happy i got to build an extreme value-for-money phono
Thanks for sharing this!

 

[Salas]

Erlend did not listen himself to tune it up yet, from the soldering iron to the reviewer with Soviet MKT output caps and 40yrs old PSU electrolytics, yours is in a more sophisticated phase.

 

[Salas]

...But he has plan to retaliate.

 

[skouliki]

Erlend did not listen himself to tune it up yet, from the soldering iron to the reviewer with Soviet MKT output caps and 40yrs old PSU electrolytics, yours is in a more sophisticated phase.

Mine requires a bit of polishing too = better output cap. I better start saving !

 

[Salas]

Did you review your TT set up in detail by now? Platter leveling, VTA, VTF, overhang, tracking error null points, TT support... There could be hidden potential there from your last set up with older phono. Some Dyna 10X5 in the future will be the decisive step ahead from the DL-110 nonetheless.

 

[skouliki]

Im currently looking into protractors. Downloaded the guru protractor and plan to use it in a day or so. Do you know any protractors that would work really well for the dl110?

 

[Salas]

I just use the HFNRR test disc protractor which is a white carton disc accurately punched in the center. Nothing fancy.