Why My Thermometer Circuit Sucks (And How to Fix It)

Although the ammeter thermometer circuit described in my previous post works, it doesn’t work well, and in general is poorly engineered.

Let’s make a critical examination of the existing circuit, and re-design it to be:

  • More accurate
  • Over a wider temperature range
  • Using less expensive components
  • While drawing less current
  • With a faster response to ambient temperature changes
New analog thermometer schematic

New analog thermometer schematic