The Well Tempered Master Clock - Building a low phase noise/jitter crystal oscillator

[dddac]

I have just seen you own LP12/EKOS/KANDID, the best choice!

Is this Klaus' audio system?
I was in Koeln in 2019 May and I met Klaus and Hans to listen to Klaus' system.

Yes it is, he and Moni are good friends of us. His system is really impressive. He also uses the DDDAC

here is a nice report from one of my visits with Dick from Audio Creative link here ...

 

[andrea_mori]

I did listen to his system, the dynamic was really impressive.

He also use my old Driscoll design (TWTMC-D) at 22/24 MHz.
I have built a pair of these oscillators for Klaus and Hans a few years ago.

 

[andrea_mori]

After a little tweaking these are the phase noise plots of the Differential oscillator TWTMC-EXO at all frequencies (except for the 12.288 MHz, crystal not yet available).

 

[andrea_mori]

And the phase noise plots of the New Driscoll oscillators TWTMC-DRIXO.

 

[Terry Demol]

Andrea, are you planning on doing any 12.288MHz?

 

[andrea_mori]

Yes, the only condition is to meet the MOQ of 10 pcs.

 

[tom59hifi]

What with 16.9344MHz ? It seems quite undesirable freq.

 

[andrea_mori]

The same as above, the MOQ is even 10 pcs.

 

[wlowes]

These are great numbers.
To my eye, no appreciable difference between the two circuits on close in numbers meaning we can choose based on cost and implementation convenience.

 

[andrea_mori]

Same crystals, same performance, same cost, same size, the only difference is the little higher output level of the DRIXO.

 

[wlowes]

From pictures from memory, it appeared one of them had a larger BOM which could impact to a small degree the parts cost and effort to solder SMT.
Granted insignificant in the full picture.

 

[HpW]

After a little tweaking these are the phase noise plots of the Differential oscillator TWTMC-EXO at all frequencies (except for the 12.288 MHz, crystal not yet available).

Same crystals, same performance, same cost, same size, the only difference is the little higher output level of the DRIXO.

IMHO, it would be wise to present your stuff in a web side, so turtles may understand your product palette with figures, sizes, output shape, performance and comments about as they come on the table.

>> As I missed within the XXX pages

TWTMC-EXO Differential oscillator: is this a symmetric sine output or??

While you have the expensive measurement gear to complete as a product and easier order tables..

just my 2 cents

Hp

 

[Supersurfer]

I did listen to his system, the dynamic was really impressive.

He also use my old Driscoll design (TWTMC-D) at 22/24 MHz.
I have built a pair of these oscillators for Klaus and Hans a few years ago.

What a small world we live in. I have also visited Claus his system some years ago. Claus is a nice guy and his horns are very impressive, as is his listening room.

 

[Alexiss]

After a little tweaking these are the phase noise plots of the Differential oscillator TWTMC-EXO at all frequencies (except for the 12.288 MHz, crystal not yet available).

Hello Andrea, Hope you're doing well.
These results are truly remarkable, specially the 11.2896 MHz oscillator. I haven't seen anything quite like it.

BTW: What do you mean by "a little tweaking"?

Best regards:
Alex

 

[andrea_mori]

IMHO, it would be wise to present your stuff in a web side, so turtles may understand your product palette with figures, sizes, output shape, performance and comments about as they come on the table.

>> As I missed within the XXX pages

TWTMC-EXO Differential oscillator: is this a symmetric sine output or??

While you have the expensive measurement gear to complete as a product and easier order tables..

just my 2 cents

Hp

Let us finish the tests and then I will publish all the infos including some comparative tables.

 

[andrea_mori]

Hello Andrea, Hope you're doing well.
These results are truly remarkable, specially the 11.2896 MHz oscillator. I haven't seen anything quite like it.

BTW: What do you mean by "a little tweaking"?

Best regards:
Alex

Hi Alex,

I meant fine tuning of the drive level of each crystal (single frequency) and a little update of the LC tank used in the Differential oscillator.

The Differential oscillator is single ended output like the Driscoll, I named it differential because it uses the active device in differential configuration with the crystal in the feedback loop.

 

[agent.5]

Any way that we can get differential output from the Differential oscillator?

 

[andrea_mori]

Sorry but differential output is not planned.
You could use a RF transformer to convert single ended to differential.

Just a curiosity, why you need differential output?

 

[MarcelvdG]

Presumably to drive a differential DAC, https://www.diyaudio.com/forums/att...lve-dac-linear-audio-volume-13-a-kicadtop-pdf

 

[agent.5]

yes to Marcel's statement. I kicad something using this IC, and this something is used to connect to Marcel's Valve Dac.

https://www.idt.com/us/en/document/dst/859s0212i-final-data-sheet