@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.
H
