Originally Posted by dcramer
I'd have to see the circuit.
I guess there is the potential for the chip itself to be dead, but assuming the circuit is fine I'm only concerned with the inputs and outputs. I picture the LM1815 circuit as a black box. I input VR+ and VR- and I get an output.
The application guide shows the output going to a relay. I'm guessing that's to trigger the relay to power the chip. If that's the case would a pull up resistor be required? The application doesn't specifically state this.