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The Well Tempered Master Clock - Building a low phase noise/jitter crystal oscillator
The Well Tempered Master Clock - Building a low phase noise/jitter crystal oscillator
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Old 20th June 2021, 09:11 PM   #3921
wlowes is offline wlowes  Canada
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That was the basis for my implementation decisions as well. Supersurfer commented on the fist gen WTMC that it was not significant to move to batteries based on his subjective listening. There are lots of good linear supplies or easy to build if so inclined. No need for supercaps etc. Just a decent low noise reg after a well filtered supply IMHO.
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Old 21st June 2021, 02:19 AM   #3922
diyiggy is offline diyiggy
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I tried on the Ian Masterclock , LT3042 reg, LiPoFe direct and with this reg and TS7A Ti reg from a good R-Core traffo : this last won from a large margin with little help of th FCA CAP. I'm not surprised you find a good power supply good enough.



Have to test the always power on clock, I have no doubt seing your testimonials it will be better. Let see where Doede/Supersurfer experiments go as well.
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Old 21st June 2021, 04:12 PM   #3923
SimonJ is offline SimonJ  United Kingdom
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First clock built and working
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Old 22nd June 2021, 06:45 PM   #3924
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Ca rigol pas ! Nice little scope
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Old 24th June 2021, 05:53 PM   #3925
bbest is offline bbest
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Hello!

I get on hands:
1) 2pcs TWTMC-DRIXO (22.5792 and 24.576 MHz)
2) 2pcs TWTMC-STS (Sine to square converters)

How much power supplies must be used:
- 1 for two TWTMC-DRIXO (18V) and 1 for two TWTMC-STS (5V)
- or 2 for each TWTMC-DRIXO and 2 for each TWTMC-STS
?
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Old 24th June 2021, 06:45 PM   #3926
andrea_mori is offline andrea_mori  Italy
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The Well Tempered Master Clock - Building a low phase noise/jitter crystal oscillator
1 for two is fine.
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Old 24th June 2021, 08:38 PM   #3927
Supersurfer is offline Supersurfer  Netherlands
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Wouldnt this create interference between clock families through the power supply?
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Old 24th June 2021, 09:21 PM   #3928
dddac is offline dddac  Germany
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The Well Tempered Master Clock - Building a low phase noise/jitter crystal oscillator
In principle Yes, unless the Output impedance of the PSU is Zero. Hence shunts and ultracaps do a nice job.

Also the design of the clock circuit will have ways to decouple itself from the PSU

But even when yes, the question is how much do they influence and is it noticeable.

Andrea can shine a light on this as it is his design, how much the clock will allow interference when connected to one psu at a certain output impedance (as function of frequency) and may be get us a clue in which frequency range the power supply is most likely to interfere the clocks when impedance is not low enough
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Old 24th June 2021, 10:26 PM   #3929
Joseph K is offline Joseph K  Hungary
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in theory, these clocks present a totally constant, fix current draw: 69mA for the 2x MHz case, here.
The output pure, single freq RF signal has no chance to appear backwards on the PS line.. if not by EMI/RFI radiation conductance and pickup..
So again in theory, easier case is hard to find.. they need low noise 16V cca, constant current draw 140mA for two, and go..
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Old 24th June 2021, 10:43 PM   #3930
andrea_mori is offline andrea_mori  Italy
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The Well Tempered Master Clock - Building a low phase noise/jitter crystal oscillator
Yes, they are constant loads so there is no current modulation, the simplest load for a regulator.

Moreover the DRIXO circuit has very good rejection to the PS noise.
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