- Joined Mar 19, 2019
New to comparators and breadboarded this to play with. Voltage divider to provide 2.5V reference voltage on inverting input, potentiometer to vary noninverting input 0-5V, 2N2222 on output to drive LED for output visual confirmation. It works, but turns on at 0.11V??? What is going on here that I am missing? The LM311 is rated to sink 50mA so the 2N2222 shouldn't be needed.