[time-nuts] HP5065A digital clock info

paul swed paulswedb at gmail.com
Tue Sep 27 18:25:58 UTC 2011


Ed the 5065a manual does have the schematics. Its available online free. I
think Diddiers site has it. There seemed to be at least 2 chips that were
used.
Bottom line is the data on how hp used and drove is available which is great
news
Paul
WB8TSL

On Tue, Sep 27, 2011 at 1:54 PM, ed breya <eb at telight.com> wrote:

> I am restarting an old project to transplant my HP Z3801A guts into a 5065A
> carcass, and now designing the power system. I'd like to keep the original
> LED clock function, but with all new power and interface. I traced out the
> circuit partially a few years ago, and am going by the notes I made back
> then.
>
> The clock IC is a 28 pin DIP, marked with the National Semiconductor logo,
> and only the code "025B." I assume it is a standard clock IC of the era,
> probably PMOS. Does anyone know the true part number? I have never seen a
> 5065A schematic or parts list. The HP part number may help if it can be
> cross-referenced. I have looked at data on a number of National and other
> clock ICs from back then, and saw none that seem to match what's in there.
>
> Ed
>
>
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