@hensing just look at the data sheet. Features • Wide Single−Supply Range: 2.0 Vdc to 36 Vdc • Split−Supply Range: ± 1.0 Vdc to ± 18 Vdc • Very Low Current Drain Independent of Supply Voltage: 0.4 mA • Low Input Bias Current: 25 nA • Low Input Offset Current: 5.0 nA • Low Input Offset Voltage: 5.0 mV (max) LM293/393 I wouldn't worry about the LM393 destroying your Arduino.