I am using YHDC (SCT013) split-core current transformer (100A:50mA) for sensing 3-phase AC. I have connected a 33-ohm burden resistor to the current transformer and with the voltage divider circuit, I am able to get approximately 1-volt output from the current transformer with an offset of 2.5 volts.
The current transformer and voltage divider circuit is as follows,
My final goal is to feed this output to the NAND, but for NAND the gate minimum voltage must be higher than 3.5 volts. I tried using UA741CN Op-Amp to amplify current transformer output, but I am unable to amplify the voltage.
How do I amplify the voltage from a current transformer?