The simplistic Salas low voltage shunt regulator
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quanghao
diyAudio Member

Join Date: Sep 2009
Location: Vietnam
Quote:
 Originally Posted by 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.
Ok! thank Massimo!

 21st November 2009, 12:24 PM #1532 RCruz   nhinstruments diyAudio Member     Join Date: Sep 2006 Location: Wallis Hi Salas I bypassed the 10r R1 with a 47r and am now reading 250mA between the smoothing cap and the shunt... (I am testing the shunt without any load). Is this the correct way to measure shunt´s working current ? Regards Ricardo
 21st November 2009, 01:10 PM #1533 stormsonic   diyAudio Member     Join Date: Aug 2008 @RCruz R1=10 Ohm, bypassed with 47 Ohm. Total resistance = 8.24 Ohm Measure voltage drop across this paralleled resistor. Divide voltage with resistance to get current. For 250mA voltage drop should be approx. 2.06V Parallel resistance Calculator Last edited by stormsonic; 21st November 2009 at 01:11 PM. Reason: Link added
 21st November 2009, 03:53 PM #1534 RCruz   nhinstruments diyAudio Member     Join Date: Sep 2006 Location: Wallis My measurements are 8.39r on R1, 1.99Vdrop on R1 so I calculated 0.237A... but measuring the current flow in the shunt input I get 0.25A.....All this without loading. How can I explain the current diferences ? Ricardo Last edited by RCruz; 21st November 2009 at 03:55 PM.
 21st November 2009, 04:18 PM #1535 Salas   diyAudio Chief Moderator     Join Date: Oct 2002 Location: Athens-Greece Dvm?
 21st November 2009, 05:37 PM #1536 RCruz   nhinstruments diyAudio Member     Join Date: Sep 2006 Location: Wallis Probably I settled for 10r//27r Vdrop R1 = 1.964v Current should be 265mA. These are the measurements on the 4wire shunt I am now going to try ! It gets hot.... 76ºC on the power mosfet but I have good sinks. Ricardo
 21st November 2009, 05:38 PM #1537 RCruz   nhinstruments diyAudio Member     Join Date: Sep 2006 Location: Wallis My browser makes me repeat posts
 21st November 2009, 05:43 PM #1538 Salas   diyAudio Chief Moderator     Join Date: Oct 2002 Location: Athens-Greece
RCruz
nhinstruments
diyAudio Member

Join Date: Sep 2006
Location: Wallis
Looks like this
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 21st November 2009, 06:58 PM #1540 Salas   diyAudio Chief Moderator     Join Date: Oct 2002 Location: Athens-Greece I always liked those green perfboards you use. I never seen them in stores here. You know, the sinks are rather small for the current. The IRFPs are dogs though.

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