I agree that your regulator is among the best regarding noise performance, but it would be nice to find a cheap and simple low noise IC regulator
I've found a 20nV/SqrrtHz regulator, the ARX5001 from Aeroflex but I can't find a source online....
http://pdf.searchdatasheets.com/pdf/149/149.pdf
Some other low noise regulators claimed to be for digital AUDIO use ...
http://www.calmicro.com/products/data/pdf/cmpwr161.pdf
http://focus.ti.com/lit/ds/symlink/tps79530.pdf
Pls share with us if anyone have experience with them.
carlosfm said:
Hi
I'd take a zener or a ref diode, and RC filter it to death, and put it in an emitter follower.
Otherwise a decently designed discrete shunt, but that requires knowledge, the emotter follower does not......
Stay away from integrated regs. Even if they are reasonable, they spit out noise current in the reference leg......
cheers
I have a Tek Scope with FFT built in -- but it is mostly used for power supply testing, for audio I have a HP 3581 -- like the 3580 (140dB) but a meter readout instead of CRT -- it can be attached to a plotter -- I am afraid that the bargains which stemmed from the US Tech bubble are disappearing.
It is agonizing whether to repair the HP465A or gut it. I think it's going to be the latter as the device also has an offset problem --
It is agonizing whether to repair the HP465A or gut it. I think it's going to be the latter as the device also has an offset problem --
Regulated Powersupply for Clock
http://www.diyaudio.com/forums/showthread.php?postid=335968#post335968
What emotter follower?, In this opst in repply to Fred Mak yu vantilated a whale diffarent opinioon:Guido Tent said:
http://www.diyaudio.com/forums/showthread.php?postid=335968#post335968
time for a Super-Regulator -- the 3rd article in Audio Amateur (the one written by Gary Galo) suggested changing the reference from the LM329DZ to a low noise 2.5V, and a couple other component changes .
btw, in this series of articles they suggested regulating everything in the DAC.-- coming up with the opinion that even Phillips didn't realize how good their chip set was.
ELSO -- hitting the schnapps again or was there a problem with the keyboard ? -- Carlos just ask Elso to email his clock circuit -- you can see the discrete reg he uses.
btw, in this series of articles they suggested regulating everything in the DAC.-- coming up with the opinion that even Phillips didn't realize how good their chip set was.
ELSO -- hitting the schnapps again or was there a problem with the keyboard ?
-- Carlos just ask Elso to email his clock circuit -- you can see the discrete reg he uses.
jackinnj said:time for a Super-Regulator -- the 3rd article in Audio Amateur (the one written by Gary Galo) suggested changing the reference from the LM329DZ to a low noise 2.5V, and a couple other component changes .
btw, in this series of articles they suggested regulating everything in the DAC.-- coming up with the opinion that even Phillips didn't realize how good their chip set was.
ELSO -- hitting the schnapps again or was there a problem with the keyboard ?
Hi Jack, me a problem with the keyboard?
I was thinking Guido T. had.Now for the serious stuff:
I tried all kinds of Super-regulators with pass-transistor and without. I did not like the result in a clock circuit.
I also tried NiCd batteries, LT1086-5, pre-regulators, 5V supply of the player, separate powersupplies (transformer plus bridge rectifier), a whole bunch of SOT-23 and SOIC regulators. LM329 and TL431's with emitter follower, and God knows what else.
I will not disclose the winner but the circuit in KC-7 is second to best.
KC-7 circuit: You can download it here:
http://www.diyaudio.com/forums/showthread.php?postid=199928#post199928
Re: Regulated Powersupply for Clock
I wrote in that thread
" LEDS are too noisy, the emitter follower will just transfer the noise "
which is not in conflict with my proposal for an emitter follower
cheers
Elso Kwak said:
What emotter follower?, In this opst in repply to Fred Mak yu vantilated a whale diffarent opinioon:
http://www.diyaudio.com/forums/showthread.php?postid=335968#post335968
I wrote in that thread
" LEDS are too noisy, the emitter follower will just transfer the noise "
which is not in conflict with my proposal for an emitter follower
cheers
Re: Re: Regulated Powersupply for Clock
Guido,
And I replied: this is utterly nonsense. LED's are NOT noisy.
And I was referring to your enthusiastic reaction to Fred Mak's experiments with SOT-23 regulators.
Guido Tent said:
Guido,
And I replied: this is utterly nonsense. LED's are NOT noisy.
And I was referring to your enthusiastic reaction to Fred Mak's experiments with SOT-23 regulators.
You can keep playing innocent as you don't want not to discuss the Wenzel circuit or other circuits but I don't buy it.
Re: Re: Re: Regulated Powersupply for Clock
dear Elso,
Since you are so convinced, could you indicate the measured noise ?
There is nothing against the Wenzel circuit, except that it needs adjustment.
(It is by the way not his invention - I found examples in older spectrum analyesers using similar techniques, and I even found valve amp supplies using this trick)
Again, I believe that a properly RC filtered voltage put in an emitter follower can be dead silent.
This is a copy of the post you point at:
quote:
Originally posted by fmak
-------------------------------------------------------------------------------
No need. I measured to 1 MHz bandwidth and it is as specified.
It's one thing measuring PS noise using a resistor; it's another measuring it with the PS connected to the XO and injecting the clock signal. I try to silence the PS using the latter.
The Audiocom Supetregulator collapses under XO load and spews out hf noise spectra like someone is going sick!!
It's useful to do a spectral analysis of both PS and clock signals.
Some XOs have odd harmonics just 10dB down from the fundamental in a more or less monotonic manner.
Hi
nothing to add...............
keep posting Mr mak !
Ciao
__________________
Guido Tent
So not a single reference to SOT 23 regs at all, or do I miss your point ?
best regards
-
Elso Kwak said:
Guido,
And I replied: this is utterly nonsense. LED's are NOT noisy.
And I was referring to your enthusiastic reaction to Fred Mak's experiments with SOT-23 regulators.
You can keep playing innocent as you don't want not to discuss the Wenzel circuit or other circuits but I don't buy it.
dear Elso,
Since you are so convinced, could you indicate the measured noise ?
There is nothing against the Wenzel circuit, except that it needs adjustment.
(It is by the way not his invention - I found examples in older spectrum analyesers using similar techniques, and I even found valve amp supplies using this trick)
Again, I believe that a properly RC filtered voltage put in an emitter follower can be dead silent.
This is a copy of the post you point at:
quote:
Originally posted by fmak
-------------------------------------------------------------------------------
No need. I measured to 1 MHz bandwidth and it is as specified.
It's one thing measuring PS noise using a resistor; it's another measuring it with the PS connected to the XO and injecting the clock signal. I try to silence the PS using the latter.
The Audiocom Supetregulator collapses under XO load and spews out hf noise spectra like someone is going sick!!
It's useful to do a spectral analysis of both PS and clock signals.
Some XOs have odd harmonics just 10dB down from the fundamental in a more or less monotonic manner.
Hi
nothing to add...............
keep posting Mr mak !
Ciao
__________________
Guido Tent
So not a single reference to SOT 23 regs at all, or do I miss your point ?
best regards
-
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