This circuit uses a readily available LM317T IC and the resistors and capacitor are also available from most electronic parts distributors. The input voltage should be at least 30 volts and should come from a clean, regulated power supply. This circuit provides 4 mA which is suitable for most IEPE accelerometers and Remote Charge Converters. The 47 μF capacitor is to decouple the DC voltage from the data acquisition system.


"I plan to integrate an Isotron® (IEPE) accelerometer into a system and would like to provide my own current source. Can you offer some suggestions?"


Yes, there are several ways to implement a current source for IEPE accelerometers. We would suggest the circuit provided below:

Figure 1