I made a microphone preamp using a INA217 Instrument Amplifier IC at the heart of it and to power the overall circuit I used an LT1054 switch cap voltage converter to give me upto -15/+15 voltage, the whole circuit works fine however I am very new to using Instrument amplifier IC's and when this circuit is running it gets warm - not too hot to touch or anything just noticeably warm I just want to know if this is normal really.