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  #11  
Old 04-30-2013, 09:42 PM
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DaleB DaleB is offline
 
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Roee,

Duh. Good catch.
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  #12  
Old 05-01-2013, 07:10 AM
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rzbill rzbill is offline
 
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Curious if you considered something like this in your panel development.

LED Press to test indicator with dimming function

The relay, switch, diodes would all go away. The only wiring would be related to the circuit being monitored and a constant +12 for the internal test function.
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Last edited by rzbill : 05-02-2013 at 04:22 AM.
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  #13  
Old 05-01-2013, 07:22 AM
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Quote:
Originally Posted by idleup View Post
Would you guys mind looking at the attached circuit for providing push to test functionality to a handful of Annunciator LED's (12v) and let me know if it is okay I need some peer review... thanks.

http://www.mattandmel.com/pictures/PTT_Circuit.png

Hi Matt, I think the links for this are now working. This is the best solution for controlling cockpit lamps: http://store.makerplane.org/annuncia...-il-4a-kitset/

It's been around for 10 years and has been proven in many applications, including the FLS Microjet.
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  #14  
Old 05-01-2013, 07:37 AM
idleup idleup is offline
 
Join Date: Oct 2005
Location: San Antonio, TX
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Default Reconsidering... Please advise...

Guys, I am considering just doing away with the whole push to test circuit for these LEDs and maybe some of the indicators altogether. I originally had identified 4 indicators in my power distribution planning related to what I thought would be good information to know. However, I am not so sure anymore, what do you guys think? My original design included the following:

E-Bus Alternate Feed On - I was planning to leave this on during normal flight operations so having a green light showing it was on would prevent me from leaving it on after shutdown (and running down the battery) and also ensuring that power was in fact flowing from the Bat Bus to the E-Bus as intended. After further analysis though, I realized it is not good to fly with an indicator light on and maybe I should change this to a yellow light showing the E-Bus Alt Feed is offline or remove it altogether?

Aux Alternator Offline - Yellow indicator showing that the Aux Alternator is offline. However, this is something I would see from the Ammeter monitoring the Aux Alt in my EFIS.

Main Alternator Failure - I was going to use the indicator output built into the Plane Power Alternator for this LED but again, the Ammeter attached to my EFIS is an indicator of this Alternators failure already.

Starter Engaged - I was going to simply connect the "I" terminal from my starter contactor to an indicator to see when the contactor was engaged (it would light during starting and if the contactor ever was stuck)


Anyway, are any of these even worth while to have?

- Matt
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  #15  
Old 05-01-2013, 01:25 PM
rapid_ascent rapid_ascent is offline
 
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I'd go with the dual diode approach myself. I consider it simpler.

Use two diodes to create an logical OR function. So it's the push to test OR the application function. Then you don't need all of the switching stuff, relay etc. The control function can work independently.

So if the indicator would normally be turned on with +12 then tie the two cathodes (end with the line) together and connect to the anode of the LED. Apply your PTT signal to one anode (no line) and your control signal to the other anode (no line). If the indicator turns on with a ground connection you do the opposite and tie the two anodes (no line) together and apply your control signals to the cathode. If you have a mix I would use a switch that can create an active high(12V) and an active low(GND) PTT.
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