The simplistic Salas low voltage shunt regulator

[RCruz]

Good point.... If it proves worthwyle, I will get bigger sinks.. Thanks

[maxpou]

Hi Salas,
what's the difference in the sound if shunt 140mA and not 200mA? Because i have a problem with my heatsink. Another question: for the rectifier diode in PS what's the difference between the fast diode and ordinary diode as BY255 in the sound? Thank you! Maxpou

[Salas]

If you got really short & thick cables to the load, 200mA sounds a bit fuller.

Soft recovery diodes, not only fast, pass less gremlins where the CCS starts to chicken out rejecting up much high. A bit softer.

[maxpou]

Thank's Salas,
i have 24in. of cable between PS and preamp because my power supply is separate from my pre-amp. What's number do you purpose to me for diode? Maybe the last question LOL: How can I ground my 2 boxes if I don't want the ground loop between them? thank you! Maxpou

[Salas]

I highly recommend you to use remote sensing 4 wires configuration with such long cables. You will hear a big difference. How it is done, it has been shown many times in the thread. Just browse back. MUR120 is good, not difficult or too expensive. Ground the mains to the psu box, then use a dedicated wire to link the 2 chassis. Better it be some coax that carries the reg wiring and you use its shield for that.

[stormsonic]

Citation from Borbely Audio

"A good power supply starts with soft/fast recovery rectifier diodes, which have a major influence on the sound of the amp. The best diodes we have found are the BYV-type diodes for low-power applications, the 8A HFA-type HEXFRED diodes from International Rectifier for medium power applications and the 25A HFA HEXFRED, and the 25/50A FRED diodes from Infineon, for high power applications. They reduce noise and improve the dynamics in your amp."

Also Schottky diodes are good for low voltage applications. I am very happy with MBR1045

[Salas]

I like the Stealth series too.

[maxpou]

Thank's for reply,
sorry Salas but i don't know the remote sensing 4 wire configuration, do you want explain to me or post a schematic. Maxpou

[Salas]

Its about connecting the error loop at the load's node and the current sourcing heavy part with another set of wires to meet there too. See how Ricardo did a board for that. Simplistic NJFET RIAA

[RCruz]

Outstanding results just by replacing R1 (10r) by a 8r2.

Much better overall detail and a big step in "spatiality".... Stage size increased significatively... Need more time to hear the improvements.

Of course there is more heat inside the case but I will replace the sinks.

As per my DMM the 8r2 measure 8r6
Vdrop is 2,04
Calculated current is 237mA (this time the measurents where made with the shunts loaded by the riaa)

As I write, I am dazed by the dinamics.... awesome !

Ricardo