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Old 18th November 2009, 09:53 PM   #1521
Salas is offline Salas  Greece
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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.
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Old 18th November 2009, 10:15 PM   #1522
iko is offline iko  Canada
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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
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Old 19th November 2009, 11:16 AM   #1523
RCruz is offline RCruz  Switzerland
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Quote:
Originally Posted by Salas View Post
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 ?
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Old 19th November 2009, 11:24 AM   #1524
massimo is offline massimo  Italy
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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.
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Old 19th November 2009, 01:14 PM   #1525
Salas is offline Salas  Greece
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Quote:
Originally Posted by RCruz View Post
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.
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Old 19th November 2009, 03:10 PM   #1526
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Quote:
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.
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Old 20th November 2009, 03:33 AM   #1527
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Originally Posted by RCruz View Post
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
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Old 20th November 2009, 03:36 AM   #1528
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and!
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Old 20th November 2009, 03:56 AM   #1529
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And cricuit!
thank Salas
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Old 20th November 2009, 08:17 AM   #1530
massimo is offline massimo  Italy
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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.

Last edited by massimo; 20th November 2009 at 08:28 AM.
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