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  #1  
Old 03-04-2013, 05:42 PM
s_tones s_tones is offline
 
Join Date: Jan 2005
Posts: 114
Default Test yee circuitry skills!



This is a dimmer circuit in my plane. Combo on-off switch/potentiometer controlling panel lighting circuit via a transistor. Makes sense except for the switched circuit (via 3-4) in yellow.
I can't figure out why it's there. The (3-4) switch appears to connect "1" to ground in conjunction with movement of the pot. I cannot see what use this has.

Any thoughts?

Thanks,
Steve
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  #2  
Old 03-04-2013, 06:10 PM
ecdamm ecdamm is offline
 
Join Date: Jan 2013
Location: Grand Rapids, MI
Posts: 3
Default

Without knowing what is connected to connector pin 1 it's impossible to know its purpose. It appears to be a normally closed switch providing connection to gnd with the pot in the off position. Once the pot is turned on the closure to gnd opens but it's not connected anywhere in this schematic.
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  #3  
Old 03-04-2013, 06:22 PM
s_tones s_tones is offline
 
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Posts: 114
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Thanks. Yep, that's what I thought. Oddly I can find zero info on what might be connected to "1". But it appears that it has no bearing on the function of the panel light circuit. I will have to look again for some reference to that unlabelled pin.

Steve
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  #4  
Old 03-04-2013, 07:08 PM
dspender dspender is offline
 
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Location: Bay City, MI
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Is this information I need to know to complete my 10
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Bay City, MI
Finished my RV10 in July 2016.
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  #5  
Old 03-04-2013, 07:25 PM
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rleffler rleffler is online now
 
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Quote:
Originally Posted by dspender View Post
Is this information I need to know to complete my 10
Nope, there are much easier options available.
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  #6  
Old 03-04-2013, 08:02 PM
s_tones s_tones is offline
 
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that's for sure
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  #7  
Old 03-04-2013, 08:08 PM
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Bill.Peyton Bill.Peyton is offline
 
Join Date: Sep 2009
Location: St. Louis, MO
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If I had to guess, this is a piper arrow dimmer circuit. The connection to ground pulls the landing gear lights to ground, applying full power and thus full brightness to the lights. When the dimmer is turned on, the aforementioned lights brightness level is controlled thought the bipolar dimmer. The other pot serves to control the avionics dimmer circuit, and also turns on the nav lights by connecting 1&2.
Just a guess.....
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WARNING! Information presented in this post is my opinion. All users of info have sole responsibility for determining accuracy or suitability for their use.
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