Dear all,
I have an unusual situation. One of my "boards" has an output that produces 5.00V when high and 2.10V when low (brrr). I need that signal to drive another "board", that is inverted - on low, it should receive high of 5.0V. I was hoping a transistor inverter would do the job and made a simple circuit with two resistors and npn transistor on a breadboard. It did not really help. The output remains at 0.65V no matter what. I guess, 2.10V is not really "low" for the transistor and thus it produces "low" on the output.
Without understanding the heart and soul of it, I tried a 120k resistor on the input to lower the input voltage, but that did not help. Obviously, there is something I don't understand . Can you help, pls?
Edmunds
I have an unusual situation. One of my "boards" has an output that produces 5.00V when high and 2.10V when low (brrr). I need that signal to drive another "board", that is inverted - on low, it should receive high of 5.0V. I was hoping a transistor inverter would do the job and made a simple circuit with two resistors and npn transistor on a breadboard. It did not really help. The output remains at 0.65V no matter what. I guess, 2.10V is not really "low" for the transistor and thus it produces "low" on the output.
Without understanding the heart and soul of it, I tried a 120k resistor on the input to lower the input voltage, but that did not help. Obviously, there is something I don't understand . Can you help, pls?
Edmunds