0 7 0 0 5 www.electronics-lab.com Author Rajkumar Sharma www.twovolt.com

Simple Pressure Sensor Amplifier & Over Pressure Switch TTL Output (0-7.5PSI)

The pressure sensor amplifier built using LM358 op-amp and MPXM2051GS pressure sensor from NXP semiconductor. The circuit provides 4V

output for full scale pressure input 0-7.5PSI. One op-amp is used as amplifier and 2nd op-amp is used as comparator to provide out at set value

and can be used as over pressure switch to control the pump or solenoid. The low cost general-purpose circuit for those applications where +/-

3% performance is acceptable. Multi turn potentiometers are provided for Offset, span adjust & over/under Pressure set point to control output

devices like solid state relay, Pump, and solenoid.

Features

· Supply 12V DC

· Pressure Sensor range 0-7.5PSI

· Output 0-4V (Approx.)

· PR1 Multi-Turn Potentiometer Offset

· PR2 Multi-Turn Potentiometer Span Set

· PR3 Multi-Turn Potentiometer Comparator (Switch) output Set

· D1 Power LED

· CN1 4 Header Connector Outputs & Supply Input

0 7 0 0 5 www.electronics-lab.com Author Rajkumar Sharma www.twovolt.com

0 7 0 0 5 www.electronics-lab.com Author Rajkumar Sharma www.twovolt.com

electronics-lab

electronics-lab

ele

ctro

nic

s-la

b

Bottom Top Silk Screen Top

electronics-lab 12V DC Supply

Over Pressure O/P

Output DC Voltage

GND