Flap Limit Switch Diagram

I'm looking for a flap limit switch diagram.
I know I've seen one or two here on the forum at times, but I think the photo links are dead.

What I've seen is a setup using two micro switches (one for up stop, one for down stop) a DPDT switch, I think, and possibly the use of a couple of diodes in the circuit. (not interested in a commercial flap actuator system)
This would be a roll your own setup.

Anyone have such a diagram?

Thanks much

Sam

I have only seen them with an UP stop, since that switch is typically not momentary.

There is an example on the PH Aviation website (also a forum sponsor).

Here is a simple generic circuit that works with diodes. The only disadvantage would be the loss of 0.7 volts to the motor.



Note that the switches and diodes in this particular circuit must handle the full flap motor current (5 amps?)

http://www.vx-aviation.com/sprocket/photos/panel_elec/schematics/TRIM.pdf

Shows more detail for an UP limit switch. Note that a properly installed actuator will not require (but still could use) a down limit switch due to the actuator mechanism's run-out.

The diode only conducts briefly during operation, so the voltage drop is less of an issue. Digikey 10A01CT-ND. Microswitch is CH326-ND. Both of these parts are heavy duty to handle stall currents.

Of course, all devices added in series with the flaps can increase failure rates, but this may be minor compared to the actuator.

V

Here's another limit switch diagram.
http://tinypic.com/r/2q0rtab/9

Thanks!

Thanks for the ideas, guys!
Those should give me some options.

Much appreciated.