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    Re: Kollsman periscopic pendulous sextant
    From: Gary LaPook
    Date: 2008 Aug 31, 12:27 -0700

    That is exactly what is used with the A-10 sextant, 4.5 volts from
    three size "D" batteries. If you have one of the more modern Kollsman
    sextants that use an electronic averager you do need to supply 28
    volts to the averager since they won't work on less. For use in an
    airplane, you can make a 28 volt power suppy with one integrated
    circuit and a small amount of soldering. The IC converts 12 volt DC to
    28 volt DC and costs about $25.00. I made one and can find the source
    for this IC if anybody wants to do the same. You can also get 27 volts
    out of 3, 9 volt batteries wired in series. This works fine for the
    lights but the averager uses about 150 ma so these betteries don't
    last long powering up the averager. And they are expensive.
    You can also replace the 28 volt bulbs, or in your case the 3 volt
    bulbs, with 6 or 12 volt bulbs that are the same size and power them
    up with other battery combinations or with a cable to your lighter
    socket in the plane. If anybody needs the source for these other bulbs
    I can find it again. I think I posted all of this information on bulbs
    and on the IC about a year ago so you can probably search the archive
    for it also.
    
    gl
    
    On Aug 31, 6:56 am, werner  wrote:
    > Actually my Kollsmans are Euopean license builds (1 from Kollsman-
    > Germany and the other 2 from Kollsman-UK, and had been used in the
    > respective air forces). Those sextants have a 3 Volts lighting system.
    > 28 Volts only go into the gimbal aircraft mount. Within it the voltage
    > is transformed into 3 Volts to go into the sextant. The usual method
    > (when not installed in an aircraft) is to use a modified flashlight
    > (instead of the bulb there is a connector for a cable) with 3 D-cells
    > (flashlights were provided in the storing case).
    >
    > Werner
    >
    > On 31 Aug., 04:49, glap...@pacbell.net wrote:
    >
    > > BTW, if you need a 28 volt power supply for using your sextant at home
    > > just go down to Home Depot and buy a water sprinkler system electric
    > > transformer which puts out 28 volts and is cheap.
    >
    > > gl
    >
    > > On Aug 27, 12:12 pm, werner  wrote:
    >
    > > > Hi,
    > > > Has anyone a manual for this sextant? I need one for the "non-bubble"
    > > > type, but with the pendulum. I have three of these sextants (two good
    > > > ones, one needs overhaul).
    >
    > > > Thank you.
    >
    > > > Werner
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