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nuckolls.bob(at)aeroelect
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 Posted: Mon Oct 15, 2012 1:29 pm Post subject: lighting Hi/Lo and Dimmer - what are they? |
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At 10:33 PM 10/14/2012, you wrote:
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Does anyone have an example of the type of dimmer that would be up
to this task?
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What is the load current for the dimmer input? Is
this input really supplying power to some kind of
lamp or is it simply a voltage input that monitors
other dimmed lights with some notion of tracking
their appearance?
The specs for your device should state the "dimmer
load" requiremnts.
Bob . . .
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nuckolls.bob(at)aeroelect
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| Posted: Mon Oct 15, 2012 3:07 pm Post subject: lighting Hi/Lo and Dimmer - what are they? |
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At 01:29 PM 10/14/2012, you wrote:
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Tim and Jeff, thanks a lot for your replies.
For the moment (as i dont have a variable voltage supply) I'll just
hook up the lighting bus to +14 volts and use the auto dimming
function on the GNS430.
What about the King KI-209 "Dimmer" pin? Is your understanding that
is also meant to be connected to a variable voltage supply? They
don't mention anything about it in the manual so its a "standard" thing.
Since the current consumption is low, I suppose I could build a
variable voltage supply by simply putting a variable resistor in
series with the Dimmer circuit. Does this sound like it would work?
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The KI209 probably has incandescent bulbs for illumination.
Hook up a bench supply and measure the current. These legacy
instruments had two 12v strings in series. For 24v you
hook up to one end of hte total string. For 12v you
ground the 24v pin and drive the center-tap.
Is this the ONLY thing you need to dim . . . or will there
be other devices hooked to it? Do a load analysis (or just
wait until they're all hooked up and then measure the total
dimming load). A dimmer like this
http://tinyurl.com/9xv9dl2
is available from B&C but they come in a range of sizes
from 0.5 to 5A . . . no point in buying or building
one that's too big.
Bob . . .
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uuccio(at)gmail.com
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| Posted: Mon Oct 15, 2012 9:38 pm Post subject: lighting Hi/Lo and Dimmer - what are they? |
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On 15/ott/2012, at 23:29, "Robert L. Nuckolls, III" <nuckolls.bob(at)aeroelectric.com> wrote:
| Quote: |
At 10:33 PM 10/14/2012, you wrote:
>
>
> Does anyone have an example of the type of dimmer that would be up to this task?
>
What is the load current for the dimmer input? Is
this input really supplying power to some kind of
lamp or is it simply a voltage input that monitors
other dimmed lights with some notion of tracking
their appearance?
The specs for your device should state the "dimmer
load" requiremnts.
I'm unable to find this information in the various installation manuals.
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The GNS430 installation manual (has the information in sections 4.2 and 5.2.5 and basically states that the unit can be configured to track 28vdc, 14vdc, 5vdc, and 5vac lighting buses or an internal light sensor). [The manual (Rev M) is available if you google GNS430 installation manual. ]
Other units (the KI-209, the Pro Pilot autopilot, the KT76A transponder) manuals don't have load requirements either, they speak of the "airplane lighting bus" and "dimmer control" as if they were some kind of standard thing.
Sacha
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uuccio(at)gmail.com
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| Posted: Mon Oct 15, 2012 9:46 pm Post subject: lighting Hi/Lo and Dimmer - what are they? |
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| Quote: | The KI209 probably has incandescent bulbs for illumination.
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Yup, the lighting requirements for the KI209 are 90mA. I have a couple of other instruments which need dimming (current unknown but I will measure it next time).
| Quote: | A dimmer like this
http://tinyurl.com/9xv9dl2
is available from B&C but they come in a range of sizes
from 0.5 to 5A . . . no point in buying or building
one that's too big.
|
This kind of dimmer would do the trick for the instrument lighting.
I was thinking of using LEDs to light the cabin. Is it possible to dim these using the above circuit or do I need something else?
Sacha
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