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10-05-2018, 08:47 AM
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Join Date: Oct 2013
Location: Schaumburg, IL
Posts: 5,297
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G3X Dimmer Input
I plan to use a simple rheostat for a dimmer circuit, but need to size it appropriately. Can anyone tell me the typical current consumed on the lighting bus input for the G3X components?
I assume that they are a control circuit and only grabbing the voltage level and therefore a very low current drain.
Also curious about the 430W and SL40as well, if known.
Larry
__________________
N64LR - RV-6A / IO-320, Flying as of 8/2015
N11LR - RV-10, Flying as of 12/2019
Last edited by lr172 : 10-05-2018 at 10:48 AM.
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10-05-2018, 10:02 AM
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Join Date: Oct 2006
Location: Southeast
Posts: 569
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I installed the panel dimmer from Vans: Part Number = ES DIMMER, LAMP 1.5A.
It dims both screens of my 2 screen non-touch G3X system and works well.
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10-05-2018, 03:17 PM
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Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
Posts: 5,686
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Quote:
Originally Posted by lr172
I plan to use a simple rheostat for a dimmer circuit, but need to size it appropriately. Can anyone tell me the typical current consumed on the lighting bus input for the G3X components?
I assume that they are a control circuit and only grabbing the voltage level and therefore a very low current drain.
Also curious about the 430W and SL40as well, if known.
Larry
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The G3X and GTN lighting buses are a control voltage only, basically zero current drain.
__________________
Walt Aronow, DFW, TX (52F)
EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
FAA Certified Repair Station, AP/IA/FCC GROL, EAA Technical Counselor
Authorized Garmin G3X Dealer/Installer
RV7A built 2004, 1700+ hrs, New Titan IO-370, Bendix Mags
Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154
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10-08-2018, 08:07 AM
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Join Date: Oct 2014
Location: Milwaukee, WI
Posts: 300
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I think the Gamin install docs call for a 0-10k ohm knob.
Larry, I'm about to do the same thing but I'm adding to an existing installation. 
__________________
Matt
CFI / RV-10
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10-08-2018, 05:43 PM
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Join Date: Jan 2013
Location: D.C.
Posts: 303
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1K Ohm pot worked great for me.
__________________
Paul M.
Fayetteville, NC
Airport Bum
RV-4 / PA28-180
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10-08-2018, 09:51 PM
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Join Date: Oct 2006
Location: Southeast
Posts: 569
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Where does one obtain a 1K ohm pot?
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10-08-2018, 10:32 PM
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Join Date: Oct 2013
Location: Schaumburg, IL
Posts: 5,297
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Quote:
Originally Posted by alcladrv
Where does one obtain a 1K ohm pot?
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digikey is affordable with good variety.
Larry
__________________
N64LR - RV-6A / IO-320, Flying as of 8/2015
N11LR - RV-10, Flying as of 12/2019
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10-08-2018, 10:33 PM
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Join Date: Oct 2013
Location: Schaumburg, IL
Posts: 5,297
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Quote:
Originally Posted by rdrcrmatt
I think the Gamin install docs call for a 0-10k ohm knob.
Larry, I'm about to do the same thing but I'm adding to an existing installation. 
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If you do any lighting components on the bus, be sure to size the pot to the appropriate wattage draw on the circuit.
Larry
__________________
N64LR - RV-6A / IO-320, Flying as of 8/2015
N11LR - RV-10, Flying as of 12/2019
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10-09-2018, 03:36 AM
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Join Date: Nov 2012
Location: Launceston, Tasmania, Australia
Posts: 774
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I utilized the GAD27 for my lighting control, and the 10k pot I paired with it was the miniature linear rotary pot from sparkfun. It's compact, has a good feel and works great.
https://www.sparkfun.com/products/9939
Don't forget to purchase a knob with it.
I only used it for the LED lighting strip, as I am controlling everything else (GDU460, Aera 660, G5, GTN etc.) via inbuilt photo cells and that seems to work great, and save a bunch of wiring.
The only issue I found was that it needs to be rotated counterclockwise to increase brightness, which is not intuitive compared to how one would increase the volume on a radio. I looked in the configuration menu so see how I could possibly change this, however there doesn't seem to be an option I can find. Just keep this in mind when you are labeling your panel.
Tom.
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