What is the problem here:
A 741 op amp used as a voltage comparator. 12V is connected to pin 7, ground at pin 4, a constant voltage 1.9V at pin 2. Pin 6, the output, is free for now. I varies the voltage at pin 3 from 0 to 12V, and the output does not vary, it's always about 10.7V...
Actually it works fines sometimes, but when I test the voltages at the input, the problem happens, and the output of the 741 becomes always 12V. And it works fine again if I cease trying it for few minutes, and this is being equipped..
A 741 op amp used as a voltage comparator. 12V is connected to pin 7, ground at pin 4, a constant voltage 1.9V at pin 2. Pin 6, the output, is free for now. I varies the voltage at pin 3 from 0 to 12V, and the output does not vary, it's always about 10.7V...
Actually it works fines sometimes, but when I test the voltages at the input, the problem happens, and the output of the 741 becomes always 12V. And it works fine again if I cease trying it for few minutes, and this is being equipped..