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Old 20th April 2010, 07:28 PM   #11
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Quote:
Originally Posted by Nazar_lv View Post
he-he 0.2ohm resistor with 15v regulator
?? If I read the circuit correct, the transistor shunt takes about 2mA from the 15V (if it is 15V). A 7.5k resistor does the same.

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Old 20th April 2010, 08:16 PM   #12
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Quote:
If I read the circuit correct, the transistor shunt takes about 2mA from the 15V (if it is 15V). A 7.5k resistor does the same.
not correct. Remember Ohm's law at least. And there is formulas to calculate properly.

And output impedance of this circuit is 0.1-0.2ohm
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Last edited by Nazar_lv; 20th April 2010 at 08:18 PM.
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Old 20th April 2010, 09:03 PM   #13
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Quote:
Originally Posted by Nazar_lv View Post
he-he 0.2ohm resistor with 15v regulator
In this web page:

PSU for High end audio without electrolytic capacitors - English - Black Gate capacitors Cerafine Electrolytic electronic capacitor Nichicon power supply Pureism Silmic - Nazar audio innovations

I read:

R2=(1,25-Ueb) / (0.3/Uout)+Iload
where Uout-output voltage V, Ueb-emitter-base voltage VT1, VT4 V, Iload- load current А.

A resistor usually has dimension in Ohm

In the above formula which is the R2 dimension?

R2 = V / (A/V) + A has not Ohm dimension (Ohm = V / A)

What is 0.3?

And which is 0.3 dimension?

Last edited by diy_audio_fo; 20th April 2010 at 09:06 PM.
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Old 20th April 2010, 09:27 PM   #14
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Quote:
Originally Posted by Nazar_lv View Post
not correct. Remember Ohm's law at least. And there is formulas to calculate properly.

And output impedance of this circuit is 0.1-0.2ohm
Yes you're right, it depends on R2 doesn't it. The 2mA is for the first transistor. What's the value of R2?

Did you check the output Z of the circuit without the shunt, just the 317?
According to the data sheet, it's 0.02 ohms up to 10kHz.

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Last edited by jan.didden; 20th April 2010 at 09:29 PM.
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Old 20th April 2010, 10:43 PM   #15
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Originally Posted by Nazar_lv View Post
Really? Then show me the same.
I don't want to get into arguments, I apreciate your work, but I think you didn't invented the shunt-regulated PS. Or capacitance multiplication filtration schematics. I saw those first time in '80's when i started playing with electronic schematics ( I think even "Radio" had a few published - if you are old enough to remember).

Capacitance multiplier - Wikipedia, the free encyclopedia

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Old 21st April 2010, 12:48 AM   #16
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Old 21st April 2010, 07:27 AM   #17
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Looking again at the circuit, the shunt transistor is a small signal type with probably 600mW max dissipation. For say 500mW at 15V, that puts the shunt current at around 33mA, plus 2mA for the first transistor so say 35mA total.
The voltage across R3 is 1.2V, so across R2 we have 0.6V at 35mA so ballpark figure for R2 would be some 170 ohms.
Does that look sensible?

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Old 21st April 2010, 12:09 PM   #18
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Quote:
In the above formula which is the R2 dimension?
Ohm
Quote:
R2 = V / (A/V) + A has not Ohm dimension (Ohm = V / A)
R2 = V / (P/V)+A
Quote:
What is 0.3?

And which is 0.3 dimension?
Max Power dissipation of 547\557 (at 70-80 amb/ temp)
Quote:
Did you check the output Z of the circuit without the shunt, just the 317?
yes, he has (as any NFB regulator) inductive output impedance, that is output current dependent (as output noise)
Quote:
I don't want to get into arguments, I apreciate your work, but I think you didn't invented the shunt-regulated PS. Or capacitance multiplication filtration schematics. I saw those first time in '80's when i started playing with electronic schematics ( I think even "Radio" had a few published - if you are old enough to remember).
Its not a shunt type regulator and dont have cap. multiplication, look carefully.
Advantages of this schematic is
-no electrolitycs and it problems
-low and stable(resistive) output impedance
-Perfect transient response (Series regulator(317\337) is completely detached from load)
-High ripple rejection and low noise
-No dependence noise-output current, output impedance-output current
-no global nfb

Disadvantages
-Efficiency
Quote:
so across R2 we have 0.6V at 35mA so ballpark figure for R2 would be some 170 ohms.
Ohm's law R=U\I ... 17ohms
Quote:
R2=(1,25-Ueb) / (0.3/Uout)+Iload
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Last edited by Nazar_lv; 21st April 2010 at 12:13 PM.
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Old 21st April 2010, 01:59 PM   #19
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Quote:
Ohm
In the above formula which is the R2 dimension?
Quote:
Ohm
R2 = V / (A/V) + A has not Ohm dimension (Ohm = V / A)
Quote:
R2 = V / (P/V)+A
R2= V / (P/V)+A = V / ((V * A) / V) + A = V / A + A has not Ohm dimension

perhaps you mean

R2= V / ((P/V)+A) = V / (((V * A) / V) + A) = V / (A + A) = V / A which has Ohm dimension
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Old 21st April 2010, 04:03 PM   #20
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Quote:
perhaps you mean
yes
thanks, i will fix it
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