[time-nuts] Atomic Clocks: It is important that they keep good time, Part 1

[Poul-Henning Kamp]

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In message <5C2FCFF8.1030803 at telight.com>, ed breya writes:

>Paul, what do you mean by the display "looking pretty ratty?" As I 
>recall, the original buck regulator had regulated output voltage around 
>5V for the LEDs. and the PMOS clock IC needed something around 12V. 
>Whatever the LEDs run from, it should be regulated and well filtered. If 
>the LEDs are dim, it could be the old displays themselves are 
>deteriorated, or the regulation isn't right, or maybe a bad output 
>filter cap on the buck converter.

In my case it was clearly the power-supply, the NS clock chip worked fine.

I simply replaced the entire power-supply board with my own round PCB
with a couple of DC/DC converters and a microcontroller running of
the 5MHz (PPSDIV style) which produces a 1Hz to the NS chip:

	http://phk.freebsd.dk/hacks/HP5065A/20160112_working_clock/index.html

I still have a pile of those PCB's in case any of you want one.

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
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Never attribute to malice what can adequately be explained by incompetence.