The simplistic Salas low voltage shunt regulator

[Salas]

Ricardo

If they can achieve more Vdrop than your current Leds, yes the total current will rise when keeping same R1. I see they state Vf 2.1. If they are also typical 10-20mA they are common. I see they are very expensive though. A bag of leds in nice price from some electronics shop does the job most of the times. Especially if they allow you to test one from the bag.

[ikoflexer]

I got 100pcs Siemens orange LEDs with about 2V vdrop for like, peanuts :S I like'em but I don't know if they're audiophile approved

[RCruz]

Originally Posted by Salas

Ricardo

If they can achieve more Vdrop than your current Leds, yes the total current will rise when keeping same R1. I see they state Vf 2.1. If they are also typical 10-20mA they are common. I see they are very expensive though. A bag of leds in nice price from some electronics shop does the job most of the times. Especially if they allow you to test one from the bag.

In this case, Vf = 2,1 .... does it mean Vdrop should be 2,1V ?

[massimo]

The leds suggested in the DC B1 bom pdf available from Mouser have a Vf (typical) = 1.8 V and cost 9 eurocents each (+ 20% vat).
I'm going to place an order in few days, if you want I can increase the quantity and send them to Cascais.

[Salas]

Originally Posted by RCruz

In this case, Vf = 2,1 .... does it mean Vdrop should be 2,1V ?

The ones you linked are so. I predict 230mA or so with 10R R1.

[stormsonic]

Originally Posted by RCruz

In this case, Vf = 2,1 .... does it mean Vdrop should be 2,1V ?

Vf=Voltage Forvard, not Voltage Drop

Example: Connect 3V to LED pins. Voltage at pins will be 2.1V, this is Voltage Forvard.

[quanghao]

Originally Posted by RCruz

Nice board !

Would you please post a schematic that goes with the board so we can all follow your work ?

Ricardo

Ok! you can see some image my friend make with Salas shunt low!
thank

[quanghao]

and!

[quanghao]

And cricuit!
thank Salas

[massimo]

Quanghao, tell your friend to reduce the lentgh of the black cables connecting the shunt board to the Dac pcb to the bare minimum. Those cables must be very short if you want to get fully advantage of the very low output impedance of the power supply.