The simplistic Salas low voltage shunt regulator

[pidesd]

actually i did tried it directly to my sennheiser 52 ohm-ish and signature was AWESOME...even though noise may have hampered the sound

 

[Salas]

Did you match and DC coupled or you went AC coupling with just near about idss?

 

[pidesd]

i selected randomly... although they MAY have come from same batch

i used the attached from which i could split phase or just buffer the output depending on resistor values...

please dont mind the jfet and replace by all bsp129 circuit...

 

[pidesd]

what is nice with phase split is that you can trim resistor values to achieve desired signature...

i did not split phased for the mentioned ''tests'' above

 

[Salas]

How high an offset? Hearing hiss on headphones might be a sign its non suitable for line pre though.

 

[Salas]

i used the attached

You did not use the bottom one as a CCS to be b1 like? G+S I mean.

 

[pidesd]

with this topology, you have zero offset...at least it is what i measured.

but VDS can vary

Voltage supply= Vds top bsp+lower bsp

please understand that i m not a pro, i just thought i could experiment on a circuit...

 

[pidesd]

You did not use the bottom one as a CCS to be b1 like? G+S I mean.

yes the bottom one is a ccs G+S connected

 

[Salas]

The schematic is misleading, that is why I asked.

 

[pidesd]

Hearing hiss on headphones might be a sign its non suitable for line pre though.

no hiss..it just sounds ''noisy''

but just an impression, nothing more.

yes might not be suitable...

but on the other hand, i previously experimented with a BOZ balanced with bsp129 and it didnt sound ''noisy''...which goes against the theory

again just impressions....

 

[pidesd]

The schematic is misleading, that is why I asked.

sorry wrong schematic... i m a bit tired 🙂

 

[Salas]

Maybe like "boiling"? Could be harmonic noise?

 

[pidesd]

so...replace jfets by b1 style bsp129 and r3 by ZERO ohm

to make a simple buffer

 

[pidesd]

Maybe like "boiling"? Could be harmonic noise?

maybe...because i removed noisy trimpot from CCS source resistance for a simple resistance and it didnt change really anything....

not 100% sure about that but it was my impression anyway.

i dont know what is harmonic noise...have to look into that...

 

[Salas]

Not sure I got your schematic explanations 100% but when I will breadboard those BSPs I have around I will try a couple of configs, FFT also, and I will let you know my findings.

 

[pidesd]

Not sure I got your schematic explanations 100%

you mean what is connected to what?

OR how it could possibly work,how i can get relatively good sound from it?

you want me to redraw exatly how i soldered it?

anyway...i m enthusiatic to know your findings 🙂

 

[Salas]

Better redraw exactly what you soldered and how tomorrow when not tired and I will save it to test it for you at a point.

 

[pidesd]

no garanteed i will get better.

i'm kind of troubled and flooded recently... with thoughts on humanity entering civilization of planetary system 🙂

peacefully of course 😉

 

[pidesd]

lots of ''scandals'' surging here in canada recently...

i know the forum rules..but it was beyond me🙂

 

[pidesd]

if you have any questions dont hesitate Salas....

we see quite a turn-around in the USA too

i dont know everything but i think i know alittle bit😉