How noisy
My buddy Jay says that the LEDs are quieter than most voltage references. Sticking a 1 K resistor between the LED Stack and the 100uF will drop to noise to A.R. levels. Beau refused to draw a new schematic but I may get my sweety Fay Zemargin to do it.
My buddy Jay says that the LEDs are quieter than most voltage references. Sticking a 1 K resistor between the LED Stack and the 100uF will drop to noise to A.R. levels. Beau refused to draw a new schematic but I may get my sweety Fay Zemargin to do it.
Re: Re: Clock power supply
Guido, This is utterly nonsense!
I am using a string of LED's in a very low noise moving coil cartridge pre-pre amplifier.
😎
Guido Tent said:
Guido, This is utterly nonsense!
I am using a string of LED's in a very low noise moving coil cartridge pre-pre amplifier.
😎
Re: Re: Clocxk power supply
Yes, there is more than noise (sensitivity of fed back currents for example) and yes, it is an elegant circuit.
Ciao
fmak said:
Yes, there is more than noise (sensitivity of fed back currents for example) and yes, it is an elegant circuit.
Ciao
Re: Re: Clock power supply
KK Hos power supply.
On this site?:
http://www.kk-electronic.dk/default.aspx?l2=3&action=page
Who, what is KK Hos???
😕 😕 😕
fmak said:
KK Hos power supply.
On this site?:
http://www.kk-electronic.dk/default.aspx?l2=3&action=page
Who, what is KK Hos???
😕 😕 😕
Re: Re: Re: Clock power supply
Search in Trading Post. K K Ho is an electronics engineer in Hong Kong.
------------------------------------------------------------------Elso Kwak said:
KK Hos power supply.
On this site?:
http://www.kk-electronic.dk/default.aspx?l2=3&action=page
Who, what is KK Hos???
😕 😕 😕
Search in Trading Post. K K Ho is an electronics engineer in Hong Kong.
Re: Re: Re: Re: Clock power supply
Fred M.,
Now this is interresting as I tried to find KK Ho using the forums searchengine. Negative, nada, zip.
Then I tried worldwide Google and found it in one millisecond!:http://www.diyaudio.com/forums/showthread.php?threadid=25777
Not much information what is on Ho's PCB or clock though.
fmak said:
Fred M.,
Now this is interresting as I tried to find KK Ho using the forums searchengine. Negative, nada, zip.
Then I tried worldwide Google and found it in one millisecond!:http://www.diyaudio.com/forums/showthread.php?threadid=25777
Not much information what is on Ho's PCB or clock though.
Re: How noisy
Hi Fred,
Yes I know. You can even add additional RC sections effectively increasing the order of the filter. I believe the noise of the transistor becomes the limiting factor. It was all in this link:
http://www3.sympatico.ca/add.automation/spice/ripple.htm
But it is dead for some time.
Whether a follower or "something else" is best for a clock circuit remains to be seen.
Fred Dieckmann said:
Hi Fred,
Yes I know. You can even add additional RC sections effectively increasing the order of the filter. I believe the noise of the transistor becomes the limiting factor. It was all in this link:
http://www3.sympatico.ca/add.automation/spice/ripple.htm
But it is dead for some time.
Whether a follower or "something else" is best for a clock circuit remains to be seen.
Re: Re: Re: Re: Re: Clock power supply
If you buy from him, he will let you have circuit.
-----------------------------------------------------------------Elso Kwak said:
Fred M.,
Now this is interresting as I tried to find KK Ho using the forums searchengine. Negative, nada, zip.
Then I tried worldwide Google and found it in one millisecond!:http://www.diyaudio.com/forums/showthread.php?threadid=25777
Not much information what is on Ho's PCB or clock though.
If you buy from him, he will let you have circuit.
Paging Mr. K.K. Ho
Fmak,
An emailaddress or website referring to Mr. Ho would be helpful. I can't find any more information about his clock and powersupply.
Thanks in advance.
😕
fmak said:
Fmak,
An emailaddress or website referring to Mr. Ho would be helpful. I can't find any more information about his clock and powersupply.
Thanks in advance.
😕
Re: Paging Mr. K.K. Ho
Do a post in Trading Post about TCXO by K K Ho and ask for his email. I am not sure he wants his email disclosed in public.
----------------------------------------------------------------------Elso Kwak said:
Do a post in Trading Post about TCXO by K K Ho and ask for his email. I am not sure he wants his email disclosed in public.
Paging Mr. K.K. Ho
Hi Wichai, how are you?
So I guess Mr. K.K.Ho = nFORCE?, right?
😕
powerp said:
Hi Wichai, how are you?
So I guess Mr. K.K.Ho = nFORCE?, right?
😕
fmax measures
Fred,
Was not "8 to 10 nV/Sqrrt Hz" the noise you get when you made the measures within the TL1763?
Something more:
Could any of you advise on the design to build a psu with a separate trafo, instead of using the supply from one of the regulators in the CD player?
Pedro.
Fred,
Was not "8 to 10 nV/Sqrrt Hz" the noise you get when you made the measures within the TL1763?
Something more:
Could any of you advise on the design to build a psu with a separate trafo, instead of using the supply from one of the regulators in the CD player?
Pedro.
Re: fmax measures
Hi Pedro,
I always advise using the raw digital supply of the player. Meaning connecting the clock at he bridge rectifier or the main filter caps of the digital supply.
Some emails I received confirm this is the best approach, sonically.
Of course clock mongers do want to sell an extra supply with transformer. Or YMMV!
Also I tried recently again a preregulator like the LM317 with bypassed adjustment pin and the result (sonically), was worse than without preregulator.
But again YMMV.
pedro said:
Hi Pedro,
I always advise using the raw digital supply of the player. Meaning connecting the clock at he bridge rectifier or the main filter caps of the digital supply.
Some emails I received confirm this is the best approach, sonically.
Of course clock mongers do want to sell an extra supply with transformer. Or YMMV!
Also I tried recently again a preregulator like the LM317 with bypassed adjustment pin and the result (sonically), was worse than without preregulator.
But again YMMV.
Re: schematics
That's what I call a short circuit ! Please have a closer look at the PCB and you'll see what I mean. Pins 8 and 4 ( 5V and GND ) are shorted. The layout in post 11 was better except for the location of the 47 uF OSCON.
I advise a separate supply/transformer with any clock to avoid ground loops. When a separate supply is used there simply can't be a loop because you only connect ground at the ground of the cdplayers pcb ( at just one point ).
When an internal supply is used there is a possibility that the ground via the clock board will be a lower impedance "bypass" of the ground path of the cdplayer ( as experienced by me with various Philips cdplayers ). That can have nasty side effects like hearing the drawer/tray motor over your speakers, intermediate humm/noise that's hard to trace etc. Besides that the clock can cause stray RF that causes the supply to become "dirty". Measurements confirmed this. I don't comment on sonical differences. A ground loop is a ground loop, add the RF to it and that's enough for me. I did not like the 3-wire technique ( sharing the output and power ground over 1 wire ) as used by some clock manufacturers although it does not have the disadvantage of a ground loop.
When a separate supply is not possible please only use the raw digital supply as suggested. The analog and servo supplies have a hard time already... Take your time and make a drawing of how you want to wire the new clock. Ground is again the keyword here. Shielding of the clock is not a luxury and using shielded cable is a pre. Some turns of the output coax through a ferrite core avoids RF to wander across the shield of your cables.
pedro said:
That's what I call a short circuit ! Please have a closer look at the PCB and you'll see what I mean. Pins 8 and 4 ( 5V and GND ) are shorted. The layout in post 11 was better except for the location of the 47 uF OSCON.
I advise a separate supply/transformer with any clock to avoid ground loops. When a separate supply is used there simply can't be a loop because you only connect ground at the ground of the cdplayers pcb ( at just one point ).
When an internal supply is used there is a possibility that the ground via the clock board will be a lower impedance "bypass" of the ground path of the cdplayer ( as experienced by me with various Philips cdplayers ). That can have nasty side effects like hearing the drawer/tray motor over your speakers, intermediate humm/noise that's hard to trace etc. Besides that the clock can cause stray RF that causes the supply to become "dirty". Measurements confirmed this. I don't comment on sonical differences. A ground loop is a ground loop, add the RF to it and that's enough for me. I did not like the 3-wire technique ( sharing the output and power ground over 1 wire ) as used by some clock manufacturers although it does not have the disadvantage of a ground loop.
When a separate supply is not possible please only use the raw digital supply as suggested. The analog and servo supplies have a hard time already... Take your time and make a drawing of how you want to wire the new clock. Ground is again the keyword here. Shielding of the clock is not a luxury and using shielded cable is a pre. Some turns of the output coax through a ferrite core avoids RF to wander across the shield of your cables.
Better said:
Mmm, pins 8 and 4 are shorted and the 47 uF OSCON is between pin 4 and GND. Disconnect the vertical track to pin 8 and connect it to GND. Then it is OK.
Mmm, pins 8 and 4 are shorted and the 47 uF OSCON is between pin 4 and GND. Disconnect the vertical track to pin 8 and connect it to GND. Then it is OK.
Re: Re: Groundloop?
Jean-Paul,
I don't see a groundloop with my approach. Of course I connect the ground of the clock PCB with one wire only to the ground of the player.
😕
jean-paul said:
Jean-Paul,
I don't see a groundloop with my approach. Of course I connect the ground of the clock PCB with one wire only to the ground of the player.
😕- Status
- Not open for further replies.