The simplistic Salas low voltage shunt regulator

[schultzsch]

not yet but hope to in the near future

 

[schultzsch]

on what do you plan to use the ps Adriano ?

 

[asdiasx]

I plan to use on a 5V USB DAC from HRT (Streamer II+)...

FYI, at this moment the power comes from an Alix board (2d3) that run a Linux Audio platform (Voyage Linux MPD)...

 

[schultzsch]

well nice to hear 🙂
stay arround...when I`ll finish the pcb(one of these days) I`ll post the final layout here

 

[asdiasx]

Thanks man! Good luck!

 

[schultzsch]

what other low noise diode can I use in place of 1S1588 because seems hard to be found :-s
for 3.3V and 5V what other combinations do you reccomend in place of d1-r4 for lower noise?

 

[Salas]

IR led(s)

 

[schultzsch]

what voltage reference would I need for 3.3 and 5 volt?

 

[Salas]

Vo-(2xVbe)

 

[schultzsch]

Vbe of which of the lower bjt`s? how can I calculate this? It`s a little bit out of my knowledge this job ..

 

[schultzsch]

got it. 0.65V

 

[Salas]

Vbe of which of the lower bjt`s? how can I calculate this? It`s a little bit out of my knowledge this job ..

There are two transistors above the Vref -any type of Vref you choose- those two add 1Vbe+1Vbe to total Vout.

 

[schultzsch]

in what range of hfe should I choose the bjt`s? 100(multicorp) or 200(on semi)?
measured last night Vbe of some bc560 and got 0.68-0.7V/device

 

[Salas]

On what collector current did they give you that Vbe? Use the higher hfe batch. Aren't those the C variety? Those hfe sound bit low for 560C at least.

 

[schultzsch]

I measured them with dmm.hfe ~400 and Vbe 0.69V
yes they are C

 

[Salas]

OK hfe ~400 sounds familiar for that type.

 

[schultzsch]

Is this the Vbe I should use in the calculations?

 

[Salas]

If you can confirm Vbe at about 4mA Ic on breadboard it will be better for precision.

 

[schultzsch]

guess I have to do this with the 2N`s no? or it works the same for all?

 

[Salas]

*~2mA for R6 1K and MTP3055VL, ~4mA for 500R and MTP3055VL.