I am using an Arduino to control a DAC which is then used in conjunction with an LT1639 for a gain of 2.4. The LT1639 is connected to a 24VAC power supply.
When first giving power, the DAC will send 5V to the LT1639 and I should get 12V back from the LT1639, which I do if I have the multimeter connected before power up. But if I short it to ground or check it after start up it will show a reading of 1.3V until I cycle the power. What could be causing this? I already replaced the op-amp once.