[time-nuts] Pre-Release Docs and Schematics for the Fury Interface Board

xaos at darksmile.net xaos at darksmile.net
Wed Oct 31 11:47:09 EDT 2007


In this particular case, I would solder a "single header pin", to each  
hole in the OCXO footprint, and then use a "single wire header  
connector" to attach to it.

Then, have all 4 wires connect to the interface board via a 4 pin, connector.

This way, the Fury gets soldered only once and can be disconnected anytime.

I will add that to the schematic.

Bruce Griffiths, has been providing me with some excellent feedback on  
the EFC interface design. I am making a few changes based on his  

The more I think about it, the more I am worried about ground  
isolation between the HP OCXO and the rest of the system.

I have a few ways to approach this. One is to simply provide 3  
different voltages to the system, each isolated from each other. In  
other words, don't use
voltage regulators to get from +/-24V down to 12.

The proper solution would be for a separate board which provides 3  
different DC outputs, all isolated from each other, including ground.

1. +24V for the oven. HP OCXO's only.
2. +12V For the oven. This could be supplied by the Fury which also  
compensates for temp.
3. +/-12V for the EFC interface.

The interface board must not add noise to the Fury. Looks like there's  
more work to be done.


Quoting SAIDJACK at aol.com:

> In a message dated 10/30/2007 11:17:58 Pacific Daylight Time,
> xaos at darksmile.net writes:
>> Ok,  this one is somewhat difficult. The HP oscillators have +12 and
>> +24 V supplies. MTI requires +5 to +15 and Crystek needs +12. So  we
>> have a wide range here. What does the Fury  supply?
>> A compromise has to be made.
>> On the Fury, Is  there a connector that breaks out the pinout of the
>> OCXO or  would the individual power pins need to be directly soldered to?
>> I  would rather avoid direct soldering. I want to have the Fury is a
>> "untouched" state, if possible.
> Hi George,
> Fury supplies 10.5V nominally at the OCXO's pins next to the SMA  connectors.
> 220mA max is expected. Most 12V OCXO's will work well at  10.5V.
> Unfortunately this means soldering to the power pins of the OCXO footprint
> directly, unless you can clamp a wire into the holes.
> bye,
> Said
> ************************************** See what's new at http://www.aol.com

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