I need the full range from an LM34DZ, but I don't have an 1N914 diode. Is there a replacement?
The purpose of the ground diodes in the circuit are to lift the LM34 above ground so that its voltage drop can become negative. As such, any device that drops voltage can be used as a replacement. However, using a silicon rectifier such as a 1N4148 or 1N400x is likely the most appropriate choice due to the fact that the voltage drop is 1) not grossly dependent on the current (unlike with resistors), and 2) is high enough to be generally useful (unlike with germanium or Schottky diodes).