I want to modify the transmitter that came with my accipiter badius. The controller currently has a proportional throttle control located on the top right corner of the throttle. I would like to add a on/off toggle to the left corner of the throttle to be able to quickly turn off the motor.
The pot has 3 wires black/red/white. Which wire do use for the switch?
Thanks for any help!
Wayne

It's not really a "which wire" as much as rerouting the connections. The routing will depend upon how the pot is set up. Basically, what you need to do is interrupt, or disconnect, the white line and reconnect it to either the red or black for your on/off. No way to know which way it needs to be until you test. If you pick the wrong color, the switch will be for full throttle, not off. For normal mode, you'll need to have the switch set up such that everything is connected as it is now, i.e. white line needs to stay intact and not jumped to red or black. Should be able to do this with a single pole double throw switch (SPDT). Connect the white from the board to common. Connect one switch output to the white wire on the pot. Connect the other output to either the red or black wire. Good luck and don't blow up your TX.

Thanks MonkeyBoy,
So I can use a mulitmeter to check which wire reads through to white (black or red) with the pot in the "off" position, and this will be the one that needs to be connected to the switch for "off" position?

What the heck is an "accipiter badius"???????

Jetts

Jetts,
Its a cheap, chinese 3Ch electric glider. I got one from here for $80 delivered http://www.raidentech.com/rercracoplgl.html

The controller is driving me crazy. I only had 1 rc plane before this one, and it was a long time ago (a goldberg electra) and I bought an airtronics 4ch radio for it. I sold the radio years ago, but I'm wishing I had it back now!
The throttle on this TX is in the top right corner. It always makes me nervous because I would rather have the throttle on the left stick. Its awkard to have to reach there and turn the pot up and down, especially when I think I'm going to crash!
I'm trying to install a toggle on the left side of the controller that will let me quickly turn the throttle to "off" without having to reach up and twist the throttle pot to the off position. I'm hoping it will be one less thing to worry about!

As you suggested, all you need to do is set the pot to the OFF position, and check which side of the pot is shorted to the white wire. Then you just install a switch across those two wires to allow you to short them, effectively bypassing the pot setting.

Russell.

You might need to consider what happens if you join the two outside wires together. Imagine that you are at full throttle, the wiper of the pot in now zero (minimal) resistance from the on wire. If you now short the wiper to the off wire you are effectively
shorting the on and off wires, this might not be good for your radio.

A simple solution might be to use a double pole switch with one pole being a push to break contact this would be wired in series with the on wire.

Hope this makes some sense.
Nick

Very good point - I didn't consider that scenario. Given that the two outside wires are most likely negative and positive supply rails, shorting them would get you a whole bunch of smoke

The double pole switch is obviously the correct solution.

Well this has been an interesting project, but I finally got it. I started out with a spdt switch as suggested by MonkeyBoy. I attached the white wire to the center, a jumper back to white on one pole, and a jumper to black on the other. Result was normal in one position, and what I initially thought was off for the other. Problem was I could switch the toggle into off, and the motor would not come on with the pot, but If I turned the motor on first, then switched the toggle to off, the motor would continue to run...

I tried the jumper to red next and found that one switch position was normal, while the other was full power.

I finally found that by disconnecting the red wire from the pot, the motor would stop. I installed the switch to just turn the red wire on and off, and its working great. When I get into trouble, a quick flick and my motor is off. You never know what to expect I guess!
Thanks again for your help guys.
Best regards,
Wayne