Is this possible??

[imported_737nut]

I want to make my trim wheels on my real 737 throttlequad functional with movements while the a/p is trimming. Would the 0/0/4 relay board using 1 for the up trim and 1 for down trim function with the software. Is there a way to distinguish trim going up or down and program it to trigger the appropriate relay to drive the motor the correct direction.?
Thanks,
Rob

[737FlightSim]

Yes you could use the 0/0/4 to control the Trim motors, but you might want to use a speed controller.

The 737 uses a two speed trim. Flaps up and flaps down.

Also you would want to mount a linear variable resistor across the lead screw that moves the trim position indicator. that way you can have FS follow the trim setting on the throttle quad.

[imported_737nut]

What variables could we use David? Manual trim would be easy but i want it to work with the A/P also. On the 2 speed, i was going to use another relay to change the voltage input to the motors for that. It would be triggered by the flaps.
Rob

[737FlightSim]

The offsets is an Alan question LOL

You would be better off using PWM to control the motor, thats why I suggested a Motor speed controller.

[737FlightSim]

Hi Rob
I found the link to the motor speed controller

http://divelec.tripod.com/mc/mc7_specs.html

[imported_737nut]

Yep, thats the one. You sent me that link earlier this year and i still have it. That requires a 0-5 volt input correct. So we could use the 2-3 volt outputs of the 8/8/8 correct?
Rob

[737FlightSim]

Hi Rob
yes, but the 16/16IO would do a better job