The simplistic Salas low voltage shunt regulator

[Stixx]

That was quick...

 

[merlin el mago]

V1.2R minus for -45Vout

If I understood well can I use this schematic for -45Vout only changing Vin for -52V & R12 1k Trimmer for 500R trimmer, right?

 

[Salas]

Yes.

 

[merlin el mago]

Thanks Nick, I suspect that the sound of the V1.2R will be perfect to reg the Owen I/V DAC (A New Take for the Classic Pass Labs D1 with an ESS Dac) that's the reason I asked the minus schematic because that IV needs +- reg, BTW V1.2R sounds fantastic with my balanced Simplistic NJFET Phono RIAA but do not sounds so good in my unbalanced Simplistic NJFET Phono RIAA....

 

[Salas]

I find both 1.2 and 1.2R giving more resolution in my non balanced Riaa than 1.0 RS you use. 1.2 I find open and detailed, and 1.2R even better fleshed out. Different systems. But all 3 types are very useful and synergise better in different ways as it proves. I suspect most of all has to do with loudspeakers and rooms and the balance that suites them best.

 

[merlin el mago]

All comparisons with headphones Senns HD600 so no issues with rooms acoustics, V1.2R has less resolution with my unbalanced Riaa than V1.0 remote sense, subjectively the sound with V1.2R is far less fresh or live, seems like if you add a highpass filter so perfect for digital not for analog.

 

[Salas]

Very odd. The first thing with 1.2 class regs over 1.0 class is more resolution in my experience.

 

[merlin el mago]

It's possible that I do something bad?

 

[Salas]

Don't know in your build but the emitter follower compound with the Mosfet in 1.2 regs is definately helping HF drive of gate capacitance. First thing subjetively is more open HF and resolution as far as I can say in my system.

 

[merlin el mago]

I'm using 4.7uF Mundorf Zn polypropylene film & tin foil, there is a way to open more the highs changing values of any cap or resistor?

 

[Salas]

Having such a dramatic feel of HF loss like there is a filter as you say, it will be more worrying there is a problem than it is a passive part's characeristic. Bypass with a small teflon or use another type like Rifa or Vishay box cap in any case, so to address that scenario too.

 

[merlin el mago]

When used the Mundorf Zn as output the better sound charateristics was that are very transparents & better than any metallized but I will try your suggestion & I will come back with the result, thanks again Nick.

 

[merlin el mago]

First to bypass the caps I will change all semiconductors to be sure that aren't damaged.

 

[Salas]

If you had damaged semis it would not produce any Vout. Look for wrong values in resistors, and any layout excessive inductance.

 

[merlin el mago]

Oooops, I changed the semis before read your post, now I'm waiting to warm up to adjust the voltage prior to fire with the Riaa, when adjust the voltage I will do a picture to post & you can see about layout meanwhile I will check the value in resistors.

 

[Salas]

Think positive for that work. You may even did a cold joint over.

 

[merlin el mago]

Thanks for kind words.

 

[merlin el mago]

Great, now I can say YES I am in the V1.2R zone

 

[istvan]

Salas, could you check my schematic? This is the last version for +-15V supply?

 

[Salas]

On quick look seems OK, but check once more against the schematics of post #3200.