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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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