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Old 20th October 2011, 11:14 AM   #601
AndrewT is online now AndrewT  Scotland
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The CCS must have an adequate voltage drop during all modes of operation.
Listening cannot match measurement for this assessment.

Read my post and learn from it.
We have to ensure the circuit is within it's operating window before making any sound quality assessment.

If the circuit is not within it's operating window then all sound comparisons are, to put it simply, NOT VALID
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Old 20th October 2011, 11:49 AM   #602
PET-240 is offline PET-240  Australia
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Agree that measurement is incredibly important otherwise bad things happen, however your post read as the MOST important is measurement, I feel measurements are there to check correct operation as designed and implementation is correct, however for me listening is the last word.
I am an Industrial Electrician so I know how important measurements are!
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Old 20th October 2011, 11:56 AM   #603
AndrewT is online now AndrewT  Scotland
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When you are mucking about guessing at whether to use a 6Vac or a 9Vac or any other transformer for your PSU, then measurement is MOST important.
You MUST get into the correct operating window, BEFORE you start listening.
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Old 20th October 2011, 12:15 PM   #604
PET-240 is offline PET-240  Australia
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measurements are there to check correct operation as designed and implementation is correct

Perhaps you should follow your own advice and read my last post....as per just above.
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Old 20th October 2011, 03:25 PM   #605
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Quote:
Originally Posted by AndrewT View Post
It's another of my guesses, but 30+30Vac seems better for +-25Vdc.
Andrew,
By my calculations if we are using 30+30Vac on the secondaries then we have approx 1.4times that after rectification i.e., about 42+42Vdc. If we generously give the reg 6V on top of its output voltage of 25V then we have a spare 11V or so which surely is not necessary. Am I missing something?
Chris
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Old 20th October 2011, 04:31 PM   #606
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Originally Posted by AndrewT View Post
measure the voltage across the CCS to identify what difference there is with the two different transformers.
Supply each transformer from a Variac, setting the voltage fed in to the minimum specified by your supplier.
Measure again the CCS voltage. Do any of these CCS voltages give you cause for concern?
Your ears, no matter how good, and your brain, no matter how advanced, cannot match measurement information across the CCS.
Voltage across R301:
6.3Vac trans = 1.31V
9Vac trans = 1.36V

R301 is 10ohm

The output is the same 3.3V, the different will be CCS current of 50mA.
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Old 20th October 2011, 04:37 PM   #607
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What's the load consumption? If it's for BII or III here is the reason why sounds good...
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Old 20th October 2011, 04:56 PM   #608
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Default Powering my new B3

Powering my new B3 I need to reduce the voltage to 5.25V instead 5.5V for BII but what surprise: lowered the BiB voltage to 5.25V before without any load & after connected the B3 & "voila" now only can reach 3.37Vout, the current is the same 2.37V:3R3= 718mA, don't touched the Vref remained the same as per BII "2.5-5.5Vout BJT output reg. 1 red 1.9V LED, 1K trimmer. Other parts jumper."

I suspect that isn't the same load the B2 & B3.

Of course that I can increase the trimmer value or add a small resistor in te voltage ref area what I want to know what's happen?
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Old 20th October 2011, 05:06 PM   #609
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Quote:
Originally Posted by merlin el mago View Post
Powering my new B3 I need to reduce the voltage to 5.25V instead 5.5V for BII but what surprise: lowered the BiB voltage to 5.25V before without any load & after connected the B3 & "voila" now only can reach 3.37Vout, the current is the same 2.37V:3R3= 718mA, don't touched the Vref remained the same as per BII "2.5-5.5Vout BJT output reg. 1 red 1.9V LED, 1K trimmer. Other parts jumper."

I suspect that isn't the same load the B2 & B3.

Of course that I can increase the trimmer value or add a small resistor in te voltage ref area what I want to know what's happen?
If your load is taking too much current then it is likely that you will not be able to set the voltage. You will have to do something about the current; altering the voltage ref area components without addressing the current problem will not work.
Chris

Last edited by Backbones; 20th October 2011 at 05:08 PM.
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Old 20th October 2011, 05:21 PM   #610
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I mind 714mA for B3 is enough "The standard board requires an input voltage of 5.25V and it draws approximately 440mA when one is using the recommended set of Trident shunt regulators" & I only I'm using one 3.3V Trident the other 1.2V & 3.3V are BiB regs.
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