Here are the PCB board image of 317/431 power supply for XO. The images is ready for direct printout without the need of resizing. (The size of this board is 2.324 inches in length)
This board had not included the transformer, diode and first filter cap (470uf).
I made the supply and the result is good. And would share this to those interest.
This board had not included the transformer, diode and first filter cap (470uf).
I made the supply and the result is good. And would share this to those interest.
Attachments
Another Error
Hi LeoJar,
You missed the resistor between the collector and base of the transistor in the schematic. Something like 2k7 will do.
Seems like it is in the layout as 3k??. 😕
😎
LeoJar said:
Hi LeoJar,
You missed the resistor between the collector and base of the transistor in the schematic. Something like 2k7 will do.
Seems like it is in the layout as 3k??. 😕
😎
another schematics and board for XO
LeoJar,
Some month ago, Fmax started a thread "More on clock power supply" http://www.diyaudio.com/forums/showthread.php?s=&threadid=16179&perpage=40&pagenumber=1
There he shows a way to reduce the power supply noise to a Tent XO module usind a TL1763 LDO.
I made a board of it using his spec. and comments.
I have been using from then. But now I'm thinking on changing the design of this little board.
I attach the schematics and the board in order to get some comments from all of you.
Could you, please, say something about?
This is the schematics and pcboard
LeoJar,
Some month ago, Fmax started a thread "More on clock power supply" http://www.diyaudio.com/forums/showthread.php?s=&threadid=16179&perpage=40&pagenumber=1
There he shows a way to reduce the power supply noise to a Tent XO module usind a TL1763 LDO.
I made a board of it using his spec. and comments.
I have been using from then. But now I'm thinking on changing the design of this little board.
I attach the schematics and the board in order to get some comments from all of you.
Could you, please, say something about?
This is the schematics and pcboard
Attachments
trafo for the supply
You can use it to supply an XO module using a pair of 9V bateries or an external transformer.
Actually I'm using one of the +8V connections inside my CD player.
But I thinking to built a board for a trafo to supply, something like the ones you can see in the second page of the thread mentioned above: http://www.diyaudio.com/forums/showthread.php?s=&threadid=16179&perpage=40&pagenumber=2
Guido's supply use a choke and some more filtering that the one from LCaudio (which seems to use an small ferrite, the one at one side of the V in).
Can any of you give me some advice on what kind of choke should be better to use, where to set it and which values could I use?
Thanks a lot.
You can use it to supply an XO module using a pair of 9V bateries or an external transformer.
Actually I'm using one of the +8V connections inside my CD player.
But I thinking to built a board for a trafo to supply, something like the ones you can see in the second page of the thread mentioned above: http://www.diyaudio.com/forums/showthread.php?s=&threadid=16179&perpage=40&pagenumber=2
Guido's supply use a choke and some more filtering that the one from LCaudio (which seems to use an small ferrite, the one at one side of the V in).
Can any of you give me some advice on what kind of choke should be better to use, where to set it and which values could I use?
Thanks a lot.
It's also good...
The noise from LT1763-5 is pretty low. I don't think there is any issue in using this chip..
I do try to build one and measure the noise level....
Leo
The noise from LT1763-5 is pretty low. I don't think there is any issue in using this chip..
I do try to build one and measure the noise level....
Leo
Re: the board
Hola Pedro !
Why did you place the decoupling capacitor so far away from the XO ?
I'd suggest to place it closely besides pin 4, at the right
succes
pedro said:
Hola Pedro !
Why did you place the decoupling capacitor so far away from the XO ?
I'd suggest to place it closely besides pin 4, at the right
succes
LeoJar said:
Hi
I just looked at the spec, it is about 60nV/Sqrrt Hz (20uV in a band to 100kHz) so no need to measure (saves time)
That is not bad, at least much better than LM317T, but still not as silent as my own 5nV/Sqrrt Hz...........
succes
-------------------------------------------------------------------------------LeoJar said:
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.
fmak said:
-------------------------------------------------------------------------------
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
Clocxk power supply
Hi,
Wouldn't this scheme be more quiet?
Taken from Pat's Lab.
http://home.att.net/~patslab/3fe5755e.gif😉
Hi,
Wouldn't this scheme be more quiet?
Taken from Pat's Lab.
http://home.att.net/~patslab/3fe5755e.gif😉
Attachments
Clock Supply
Hi All,
Interestingly Lars (Lcaudio) and Andy (ALW) are using a opamp and a series pass transistor:
http://www.diyaudio.com/forums/showthread.php?postid=285110#post285110
http://www.diyaudio.com/forums/showthread.php?postid=17983#post17983
Please correct me if I am wrong Andy. Do you care to share your schematic?
😉
Hi All,
Interestingly Lars (Lcaudio) and Andy (ALW) are using a opamp and a series pass transistor:
http://www.diyaudio.com/forums/showthread.php?postid=285110#post285110
http://www.diyaudio.com/forums/showthread.php?postid=17983#post17983
Please correct me if I am wrong Andy. Do you care to share your schematic?
😉
Re: Clocxk power supply
LEDS are too noisy, the emitter follower will just transfer the noise
enjoy the weekend
Elso Kwak said:
LEDS are too noisy, the emitter follower will just transfer the noise
enjoy the weekend
Re: Re: Clocxk power supply
I was just about to put some into a I/V converter cct
what would you recommend instead ?
would regular small signal diodes in twos or threes be better ?
what would be best ?
mike
Guido Tent said:
I was just about to put some into a I/V converter cct
what would you recommend instead ?
would regular small signal diodes in twos or threes be better ?
what would be best ?
mike
Re: Clocxk power supply
Who knows, unless you measure it!
I think there is more to it than noise spec. KK Hos power supply is not as quiet as Guido's but to my ears sounds very good.
It is also small and very easy to mount!
--------------------------------------------------------------------------Elso Kwak said:
Who knows, unless you measure it!
I think there is more to it than noise spec. KK Hos power supply is not as quiet as Guido's but to my ears sounds very good.
It is also small and very easy to mount!
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