Ae Airspeed Switch + Board

1. Connect the airspeed switch to your aircraft pitot tube and static air.
2. Connect the airspeed switch output, to drive the relays on the relay board. See the appropriate diagram below. 
   NOTE: The airspeed sensor will only drive light loads such as the relay board coils.
3. Use the output of the relay board to switch from one of two voltages that will be used to drive your elevator trim motors.
4. The one item you will have to supply, is the alternate lower voltage source for your slower speed. You may use simple diodes or zener diodes in series with your 12Vdc supply, or use an adjustable source like the "Ray Allen Company's" Speed Control. Click the link below to view and/or print out a suggested connection diagram.

1. Connect the airspeed switch to your aircraft pitot tube and static air.
2. Connect the airspeed switch output, to drive the relays on the relay board. See the appropriate diagram below. 
   NOTE: The airspeed sensor will only drive light loads such as the relay board coils.
3. Use the output of the relay board to activate or disable your flap down electronics. See the appropriate diagram below.

Airspeed Switch

• Pull-in airspeed adjustable with a screw driver
• Switch Current Rating: 0.04A max.
• Adjustable from 70 MPH to 160MPH

Relay Board

• Mounting Hardware included
• Relay contacts protected against arcing from inductive loads such as motors.
• Switch contacts
• Two relays, SPDT (Single Pole, Double Throw)
• 10A max. current
• Relays are 12V relays