How to Smooth Out Pressure Transducer Output

Capacitors act like electrical shock absorbers, smoothing out voltage spikes.

Pressure transducers are electronic devices that convert mechanical energy into electrical energy. Primarily, they work by sensing the depth of depression of a switch or other control mechanism into a component called a "gage." When the control mechanism presses against the gage, it compresses and deforms the gage. The gage in turn puts out a voltage that is proportional to the amount of pressure applied. However, in some applications, keeping a smooth, steady current is a problem. Fix this issue using capacitance. Does this Spark an idea?

Instructions

1. Identify the lead on the negative side of the voltage transducer, downstream from the current.

2. Identify the maximum and minimum voltage output of the pressure transducer. Look at the manufacturer's specifications to do this.

3. Select a capacitor appropriate for the voltage level. Capacitance is measured using two main measurements: Farads, which is a measure of how much charge a capacitor can hold, and working voltage. Working voltage is the maximum voltage capacity of the component before it shorts out. Ensure the maximum voltage capacity is lower than the maximum output of the pressure transducer.

4. Solder the capacitor into the circuit. Ensure you solder the positive lead of the capacitor on the side of the pressure transducer. Some capacitors will short out or explode if they are wired backwards. The capacitor will store a small charge of electricity, releasing it when the voltage drops, thus smoothing the voltage output.

References

• Antonine Education: Capacitance of a Capacitor
• Omega.com: Pressure Transducers

Resources

• Sensor: Pressure Transducer Tutorial