I have constructed a circuit which uses two non-inverting unity gain buffers on one chip as stage seperation. I'm using a TL072CP chip with dual op amps on it and have followed the datasheet design for a non-inverting unity gain buffer. I'm having a problem whereby the output on both op-amps on the chip is giving what looks like an inverted signal of the inputs. The inputs are pulses generated from two seperate 555 timers, an output from one 555 timer feeds into the non-inverting input of one op-amp.
In my circuit I measure the following signals (in red) at each of the pins. I've triple checked the connections and I am fairly certain that I haven't wired something up wrong.
When I measure on the non-inverting input terminal my input signal looks like this. The datasheet which gave the schematic above advised to ensure that the input voltage must be within the recommended common-mode range. The valid common-mode range is 4 V to 12 V and my input signal amplitude is 4.64V so I don't believe this to be an issue.
Measuring on my output terminal shows this and the signal looks to be inverted
Could anyone suggest why this may be happening?