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.
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.
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.
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
?
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
?
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
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
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..
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..
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.
Moreover the DRIXO circuit has very good rejection to the PS noise.
Andrea, for my education, would it ideally be as simple as:
-one power supply and a low noise regulator for each device? Or,
a low noise reg followed by a supercap to each?, or simply
one power supply to both devices?
-one power supply and a low noise regulator for each device? Or,
a low noise reg followed by a supercap to each?, or simply
one power supply to both devices?
From our measurements simply one power supply to both devices.
My suggestion is still battery for both oscillators to decouple them from the main AC.
Although we have measured the phase noise of the DRIXO powered by a simple 317 and there was no difference.
My suggestion is still battery for both oscillators to decouple them from the main AC.
Although we have measured the phase noise of the DRIXO powered by a simple 317 and there was no difference.
LM317 - Actually that is exactly how I run them in the tests...
Final step in my clock tests will be changing the PSU and see if there is any difference.
Final step in my clock tests will be changing the PSU and see if there is any difference.
Is it possible to change TWTMC-STS for power supply 16V, same as TWTMC-DRIXO/ May be change some resistor?
I'm sorry but it's not possible.
The max voltage power supply for the STS is 5VDC, if it will be connected to a device which tolerates 5V input, otherwise you have to use 3.3VDC.
If you are using Ian's FIFO the STS is powered directly by Ian's board.
The max voltage power supply for the STS is 5VDC, if it will be connected to a device which tolerates 5V input, otherwise you have to use 3.3VDC.
If you are using Ian's FIFO the STS is powered directly by Ian's board.
@Andrea - the BOM for the 6Mhz clock is missing the C27 capacitor which I see is needed for the 5Mhz clock, is this correct?
Hello,
I am still waiting for some cables and a part from the ldovr.com site.
After that i will send Doede my 6 clock boards, a 61,7 F 18 volt supercap and a bit more.
The idea is to use a 16,8 volt battery charger. After the 16,8 volt is reached. An arduino based circuit will decouple the charger and switch to a choke input supply followed by a low voltage drop regulator that will give 16,5 volt to the supercap.
This Arduino circuit was described by Doede a few weeks ago.
Greetings,Eduard
I am still waiting for some cables and a part from the ldovr.com site.
After that i will send Doede my 6 clock boards, a 61,7 F 18 volt supercap and a bit more.
The idea is to use a 16,8 volt battery charger. After the 16,8 volt is reached. An arduino based circuit will decouple the charger and switch to a choke input supply followed by a low voltage drop regulator that will give 16,5 volt to the supercap.
This Arduino circuit was described by Doede a few weeks ago.
Greetings,Eduard
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