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Old 17th May 2020, 05:54 PM   #1931
carlmart is offline carlmart  Brazil
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Quote:
Originally Posted by potstip View Post
ldo regulators have great noise and psrr performance. Only issue is high Zout compared with discrete regulators. after ldo is there any buffer circuit possible to decrease Zout?

Output impedance of LT3045 to 0,17mOhm @ 80Hz and 0,25mOhm @ 700Hz.
Simulation for LT3042, supposedly a bit inferior to LT3045, shows 12uOhm @ 80Hz and 29uOhm @ 700Hz.
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Old 24th May 2020, 05:45 PM   #1932
jackinnj is offline jackinnj  United States
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Super Regulator
Quote:
Originally Posted by carlmart View Post
Simulation for LT3042, supposedly a bit inferior to LT3045, shows 12uOhm @ 80Hz and 29uOhm @ 700Hz.
That's because you have a heavy load on the regulator and pass transistor.

The convention is to use a 25mA load ... this keeps everyone on the same page when testing regulators for stability. (If I were to go back and retest all the regulators for the Linear Audio article I would use 25mA and run the Z-test out to a few megaHertz - )

Set I_1 to AC=1, DC=0.025 and eliminate R7, or AC=1, DC=unspecified, R7=600 Ohms.

D45H11 is in the LTSpice library isn't it? BD140 isn't a good choice as hfe is lower and safe operating area smaller.
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Old 25th May 2020, 01:44 AM   #1933
carlmart is offline carlmart  Brazil
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Please make the changes you think necessary on the asc file and re-upload it.
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Old 25th May 2020, 06:01 AM   #1934
meldano is offline meldano  Germany
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Guys,
for LED D1,6 is there a special type necessary?
Can I choose a 2mA low current led. Is the forward voltage or the Resistor value for R2,9 important ?

Thanks
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Old 25th May 2020, 02:34 PM   #1935
lehmanhill is offline lehmanhill  United States
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Quote:
Originally Posted by potstip View Post
after ldo is there any buffer circuit possible to decrease Zout?
It is possible, but I will leave it to more experienced members to explain any downsides and limits.
I built the Reliaxed2 pre-amp a decade ago. That design used an opamp at low gain as a buffer for an analog section power supply. Of course, an opamp is limited in current output capacity and most would struggle at the 25 mA test standard. And the opamp needed to be close to the load because of capacitance drive limits. But an opamp running near unity gain can have a low output impedance.

Naturally, this approach could be implemented with discrete components.
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Old 27th May 2020, 09:40 AM   #1936
potstip is offline potstip  Turkey
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Quote:
Originally Posted by lehmanhill View Post
It is possible, but I will leave it to more experienced members to explain any downsides and limits.
I built the Reliaxed2 pre-amp a decade ago. That design used an opamp at low gain as a buffer for an analog section power supply. Of course, an opamp is limited in current output capacity and most would struggle at the 25 mA test standard. And the opamp needed to be close to the load because of capacitance drive limits. But an opamp running near unity gain can have a low output impedance.

Naturally, this approach could be implemented with discrete components.
In Reliaxed2 passive amp did you noticed any sound improvement of relay based volume control over standart cement or alps pots?
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Old 27th May 2020, 12:33 PM   #1937
lehmanhill is offline lehmanhill  United States
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First, the Reliaxed2 isn't completely passive. It has a single opamp with about 6 dB gain in the signal path. That was used to control impedance.

I did compare it with a mid level Alps pot and also to a Lightspeed Attenuator that I borrowed from a friend. The differences weren't big, but I did prefer the Reliaxed2 over the Alps and Lightspeed.
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Old 27th May 2020, 02:27 PM   #1938
amplidude is offline amplidude  Denmark
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Default "Jung super regulator "

Hi all.
Surfed a bit around on fleebay and noticed this regulator, it uses lme49710 opamp, and I guess all those led's are current sources.
There's literally no specs on this thing which makes me suspicious.
Has anyone here tried one and maybe measured it? And the topology? I don't recognize any jung here.
Link to product.
HiFi Walt Jung Super Regulator DC Power Supply Board Linear Audio For DAC Preamp | eBay
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File Type: jpg Screenshot_20200527-161700_eBay.jpg (728.7 KB, 214 views)

Last edited by amplidude; 27th May 2020 at 02:50 PM.
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Old 27th May 2020, 04:19 PM   #1939
jan.didden is offline jan.didden  Europe
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This has nothing to do with Walt Jung or Linear Audio, typical trick to draw traffic.
You pays your dollar and you takes your chances, with no indication that it even does what they suggest.

Jan
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Old 27th May 2020, 05:22 PM   #1940
amplidude is offline amplidude  Denmark
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Your problaly right, but it got me courius though
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