The simplistic Salas low voltage shunt regulator - Page 584 - diyAudio
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Old 8th April 2013, 02:55 PM   #5831
Salas is offline Salas  Greece
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Its bcs there is a lower capacitance (Crss) Mosfet in this example. Same margin. Use a scope in general for verifying or modding any real system build.
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Old 8th April 2013, 05:18 PM   #5832
stajo is offline stajo  Sweden
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Hi

Is there any problem using the BiB boards to feed for example DACs that has local voltage regs on board?

Staffan
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Old 8th April 2013, 05:25 PM   #5833
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Hi Staffan,

Yes, take off the local voltage regulator if you want to enjoy all BiB perfomance

Felipe

Last edited by merlin el mago; 8th April 2013 at 05:28 PM.
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Old 8th April 2013, 05:28 PM   #5834
stajo is offline stajo  Sweden
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Quote:
Originally Posted by merlin el mago View Post
Hi Staffan,

Yes, take off the local voltage regulator.

Felipe
Thanks Felipe, but thats not an option on DACs. They need local regs near the source.

/Staffan
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Old 8th April 2013, 05:46 PM   #5835
Salas is offline Salas  Greece
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Quote:
Originally Posted by stajo View Post
Hi

Is there any problem using the BiB boards to feed for example DACs that has local voltage regs on board?

Staffan
They have done it before on vintage AD DAC with TL431 in between and it was not unstable as a system. Each total system has its quirks though and should be checked.
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Old 8th April 2013, 05:59 PM   #5836
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I use BiB to power +5VDC all BIII with Tridents and until today no issues.
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Old 10th April 2013, 10:06 AM   #5837
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Default Higher voltage Vin and Vout?

I am in need of a version with Vin of ~ +/- 55 volts and +/- 45 volts Vout.
Has work been done on a version capable of these parameters?

I appreciate all the work that has been to this point!

Thanks.
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Old 13th April 2013, 10:22 AM   #5838
kumori is offline kumori  Europe
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Hi, I encountered a problem with my BiB-based reg:

The CCS-LEDs light up, but the Vref LEDs stay dark (2 red LEDs). They are oriented properly and work if I apply external voltage to them.

The output voltage is 0V and the current draw from my lab PSU is not measurable (so below around 10mA), whereas it should draw around 100mA.

Did someone have this behavior before?
I have only a limited amount of FETs, so any educated guesses before I pull out random components are very appreciated
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Old 13th April 2013, 11:37 AM   #5839
AndrewT is offline AndrewT  Scotland
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Originally Posted by kumori View Post
Hi, I encountered a problem with my BiB-based reg:

The CCS-LEDs light up, but the Vref LEDs stay dark (2 red LEDs). They are oriented properly and work if I apply external voltage to them.

The output voltage is 0V and the current draw from my lab PSU is not measurable (so below around 10mA), whereas it should draw around 100mA.

Did someone have this behavior before?
I have only a limited amount of FETs, so any educated guesses before I pull out random components are very appreciated
disconnect the shunt regulator part.
You then have only the CCS part.
Short the output of the CCS.
Check that the CCS is delivering and controlling the current into the shorted output.
Now insert a dummy resistor, 1r0 or 10r and repeat the CCS test.
The current into the dummy load will be a little bit less than the total current draw. The CCS uses a little bit of current to power itself.

Once you know that the CCS is working, you can put the shunt back into circuit.


For beginners this is the way to build up the Salas reg. Populate just the CCS part and test it. Then populate the shunt part and test it.
__________________
regards Andrew T.
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Old 13th April 2013, 12:17 PM   #5840
kumori is offline kumori  Europe
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Quote:
Originally Posted by AndrewT View Post
disconnect the shunt regulator part.
You then have only the CCS part.
Short the output of the CCS.
Check that the CCS is delivering and controlling the current into the shorted output.
Now insert a dummy resistor, 1r0 or 10r and repeat the CCS test.
The current into the dummy load will be a little bit less than the total current draw. The CCS uses a little bit of current to power itself.

Once you know that the CCS is working, you can put the shunt back into circuit.
Thank you, this is good advice, IŽll try.
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