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The simplistic Salas low voltage shunt regulator
The simplistic Salas low voltage shunt regulator
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Old 21st November 2009, 12:49 AM   #1531
quanghao is offline quanghao  Viet Nam
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Quote:
Originally Posted by massimo View Post
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!
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Old 21st November 2009, 12:24 PM   #1532
RCruz is offline RCruz  Switzerland
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The simplistic Salas low voltage shunt regulator
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
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Old 21st November 2009, 01:10 PM   #1533
stormsonic is offline stormsonic  Slovenia
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@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
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Old 21st November 2009, 03:53 PM   #1534
RCruz is offline RCruz  Switzerland
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The simplistic Salas low voltage shunt regulator
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.
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Old 21st November 2009, 04:18 PM   #1535
Salas is offline Salas  Greece
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The simplistic Salas low voltage shunt regulator
Dvm?
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Old 21st November 2009, 05:37 PM   #1536
RCruz is offline RCruz  Switzerland
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The simplistic Salas low voltage shunt regulator
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
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Old 21st November 2009, 05:38 PM   #1537
RCruz is offline RCruz  Switzerland
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The simplistic Salas low voltage shunt regulator


My browser makes me repeat posts
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Old 21st November 2009, 05:43 PM   #1538
Salas is offline Salas  Greece
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The simplistic Salas low voltage shunt regulator
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Old 21st November 2009, 06:55 PM   #1539
RCruz is offline RCruz  Switzerland
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The simplistic Salas low voltage shunt regulator
Looks like this
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Old 21st November 2009, 06:58 PM   #1540
Salas is offline Salas  Greece
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The simplistic Salas low voltage shunt regulator
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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