Interface board for the DS1603NF ultrasonic liquid sensor. Powers the sensor and provides a 12V output under normal condition and a grounded output under low fuel alarm condition.

Wiring: From the main bus, connect a fused wire to the “12V” pad, connect panel ground to the “GND” pad, connect a momentary pushbutton switch between the “PTT” pad and ground, and connect the “OUT” pad to an EFIS alarm input.

This project is intended for use in Experimental category aircraft only. Do NOT install it in a CAR Part 3 or FAR Part 23 certificated aircraft without FAA Field Approval.

BILL OF MATERIALS:
C1: Vishay K104K15X7RF5TL2 0.1uF 50V X7R Radial Ceramic Capacitor
C2: TDK Corp. FG14X7R1E475KRT06 4.7uF 25V X7R Radial Ceramic Capacitor
J1: JST S4B-XH-A-1(LF)(SN) 4-Position 2.5mm Right Angle Shrouded Header
Q1: Microchip TN2106N3-G 60V 300mA N-Channel MOSFET, TO-92-3
R1-R2: Stackpole RNMF14FTC4K70 4.7k-Ohm 1/4W 1% Axial Resistor
S1: Pushbutton Switch, Normally Open, Momentary Type (Installer’s Choice)