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Rank precision "indicator unit" clock
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TOPIC: Rank precision "indicator unit" clock

Rank precision "indicator unit" clock 3 years, 1 month ago #1

  • Sine1040
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A project I started some time ago (2007 ?) with the purchase of four aircraft indicator units. I have no idea what they where intended for, but they came new in a vacuum sealed bag. Their production date is somewhere in the early 70's

With the displays from four of these units I was able to construct three clocks ( each unit had three 0-10 displays and two with letters and combined numbers )

The displays are of the projection type in a really small form factor.



The left meter shows seconds ( each thick mark is a second ) and the right one does a full minute from bottom to top.
The pot sets the display and backlight brightness and the switch is used to set the time ( I didn't want to alter the clock externally, the only change I made is a hole for the power connector in the place where a grounding screw used to be.

The whole thing is controlled by a Atmega8 ( probbably a bit overkill ) and timekeeping is done with its internal RTC clocked buy a dallas DS32KHz TCXO. The meters are both center zero and are PWM driven by the uC



It uses an external 12V wallwart and that volage is stepped down with a switching regulator for incandescent lamps (variable with the panelmount pot )



Hope you guys like it, I'm verry happy with how it turned out.

Last Edit: 3 years, 1 month ago by Sine1040.

Re: Rank precision "indicator unit" clock 3 years, 1 month ago #2

  • Stuckey
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That is an impressive build Do you have any more photos or build information?

Nice work!
"If the laws of physics don't apply in the future, then god help you."
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The following user(s) said Thank You: Sine1040

Re: Rank precision "indicator unit" clock 3 years, 1 month ago #3

  • Stuckey
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"If the laws of physics don't apply in the future, then god help you."
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Last Edit: 3 years, 1 month ago by Stuckey.
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Re: Rank precision "indicator unit" clock 3 years, 1 month ago #4

  • philleb
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Wow, this build is amazing .
Where did you got those aircraft parts. I want to build this by my own.
Greets.
The following user(s) said Thank You: Sine1040

Re: Rank precision "indicator unit" clock 3 years, 1 month ago #5

  • Sine1040
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Hey thanks for referring me Brian,

I didn't think there would be so much interest in these clocks.
I bought the instuments form a uk based surpluss store.
(stores.ebay.co.uk/Michaels-Electronics-Emporium)
That must have been somewhere in early 2008

They had 20+ units at the time and if I had known back then there would be interest in these things a probably would have bought a few more I contacted the seller recently only to find they where all gone.

These units being aircraft grade have every position fitted with lamps where only a small numbers was being used, so together with the lamps from the dismantled unit that gives a lot of spares of the probably not so easy to find bulbs.

The backlight uses a 1W midget flange bulb and it's lampholder is located under the "R", on my unit I discovered that the plastic color filter was discolored and warped by the heat of the bulb, so I made a LED replacement for it.

I have three working units, one sits on my desk the second one I sold a while back and the third one is still available. I might put up an ebay auction for that one.
Anyone who is interested in one can contact me before I do.

More info ... I have a few pictures from the early building stages.

The original displays ( not in the correct order )


Inside view






Last Edit: 3 years, 1 month ago by Sine1040.
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Re: Rank precision "indicator unit" clock 3 years, 1 month ago #6

  • Josh
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That thing is awesome! How much are you looking to sell the other one for??
Last Edit: 3 years, 1 month ago by Josh.

Re: Rank precision "indicator unit" clock 3 years, 1 month ago #7

  • Sine1040
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It was not my goal to start a selling topic here, but #3 is available on Ebay
Last Edit: 3 years, 1 month ago by Sine1040.

Re: Rank precision "indicator unit" clock 3 years, 1 month ago #8

  • Stuckey
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Good luck selling it; I know there were also some people interested on the Hack A Day forum as well.

EDIT: I see you left a note there as well. Should have checked before I posted this
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Last Edit: 3 years, 1 month ago by Stuckey.

Re: Rank precision "indicator unit" clock 3 years ago #9

  • Stuckey
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Well, I see that it sold. Did someone here buy it?
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