Q-94: I have a Hitec Electron-6 RC receiver and found that the instruction sheet does not indicate the polarity of the servo connectors. Do you know if the black or the signal wire should go closest to the crystal?
A-94: First of all, questions such as this should really be directed
to the manufacturer who built and sold you this receiver. I do own an Electron-6
(it is in my SCRATCH-ONE design). I looked up my instruction manual and our
reader was correct, it does not show the connector polarity. Likewise, there is
no decal on the receiver case that indicates the polarity. I did communicate
this slight problem with the people at Hitec RCD and they indicated that the
polarity would be included on all new instruction sheets.
For the record, the wire closest to the crystal is the yellow or signal lead
(that’s yellow when using a Hitec servo). The middle wire is red for battery
positive, while the third wire is black for battery negative. That black wire is
furthest away from the crystal location. In all honesty, with the battery
positive wire in the center there are only two situation that will occur. You
either have the servo and battery connector plugged in correctly and everything
works, or if plugged in opposite, nothing will work. Either way you will never
blow out a receiver or servo. To my knowledge all current RC systems use the
same polarity configuration, but some do resort to different color coding.