[time-nuts] Piezo Company OXCO pinouts (William Rice)
Richard H McCorkle
mccorkle at ptialaska.net
Wed Oct 1 18:30:20 EDT 2008
Not knowing the rated voltage of the unit I took the overly cautious
approach of slowly increasing the supply voltage until the frequency
first stabilized when varying the voltage over a small range. The unit
stabilized at approximately 10.8v (12v - 10%) so I specified 12v as
the lower limit of the input voltage required. The internal regulator
will run cooler and the oven will draw more current and take longer
to stabilize at the low end of the usable voltage range.
I didn't test for the maximum voltage as this could turn into a
destructive test if not done properly. I would suspect the internal
regulator can handle input voltages greater than 26.4v (24v + 10%)
safely so the unit could be specified at 24v +/- 10% in the Lucent
application it was designed for. The higher voltage would speed oven
response to changing temperature and reduce the warm-up time.
> Hi Richard,
> Many thanks for the info, this was most helpful and I have the unit
> running fine now. The only real difference is that my unit seems to be
> labelled to run off 24V and the data sheet shows 12V. My serial number
> is 2331 (9439) which is not listed on the pdf you sent. After the
> initial panic over running it off 24V for some hours to test it, I
> have tried it on 12V and it still seems to work fine. The difference
> is that the frequency has dropped about .5ppm and the case feels
> cooler to the touch. Now I don't know what the power voltage should be
> as someone else on the list mentioned the nominal is 25.5V. Let's have
> a vote :)
> Thanks for your help.
> 2008/9/30 Richard H McCorkle <mccorkle at ptialaska.net>:
>> I purchased three Piezo 2920136 units and the attached file documents
>> what the pinouts and EFC requirements are. Hope you find this useful.
>>> Just new to this list and found this post while trawling the net for
>>> the same info. This is a manual reply to a previous posting so the
>>> message ids won't tally, sorry.
>>> --- William Rice wrote:-
>>>> Have a surplus Piezo Crystal Co. oscillator. 3x2x2" with 6 pins on bottom, no
>>>> Model# 2920136 / 10.000 Mhz (101728-001)
>>>> Had trouble finding info.... Maybe standard configuration, 9337 stamped on
>>>> probably just obsolete.
>>>> Any help appreciated.
>>>> Did find one on ebay, my unit is not as abused.
>>>> Do not know if it needs external control.
>>> I have a Piezo Model 2920136 10MHz oscillator which seems to be the
>>> same as in your url link above. The info I have to date for the six
>>> pins from left to right:-
>>> Out, GND, +24V, ?, Vcc, GND
>>> I don't know what the 4th (?) pin does and I also have know idea as to
>>> what voltage needs to be connected to the Vcc pin. Any help please?
>>> Steve Rooke - ZL3TUV & G8KVD
>>> Omnium finis imminet
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> Steve Rooke - ZL3TUV & G8KVD
> Omnium finis imminet
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