I am trying to design a circuit that will convert a unipolar 0 - 12V square wave signal of about 1kHz to a bipolar +/- 12V signal.
I have tried using a differential amplifier design approach similar to this (using classic diff. amp equations): https://masteringelectronicsdesign.com/design-a-unipolar-to-bipolar-converter-for-a-unipolar-voltage-output-dac/
The circuit I created is below with a TL074 op amp; however at the output of the op amp there is no signal (it just remains at about -12V). Can someone please explain why, or please direct me to a better way to convert a unipolar signal to a bipolar one?
I have also tried putting a .1u capacitor in series with the signal to the non-inv. input to create a bipolar signal input, but this did not work. I have also tried several other op amps (LM741, 4558, and 1458), all of which do the same thing.