[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.
> ************************************** See what's new at http://www.aol.com
More information about the time-nuts