NOOB WARNING!!!
Okay, please forgive me, as I've NEVER used an op amp before. All I know about electronics, I've learned from reading the internet. I've had NO college training, unless you count Algebra 121 and English 121.
That said, I picked up a LM741CN 8-DIP op-amp from RadioShack to see if I could use it as an output buffer for PWM, to do some simple DAC.
I have it set up in a voltage follower configuration, as below:
V+: 5.5V
V-: GND
Non-invert input: 0-5V PWM from dual-stage RC filter
Invert input: Jumped to output
Offset null pins: NC
I can get the output to swing to around +5.43V just fine. The problem is as soon as the input goes lower than ~1.92V, the output freezes and will not drop below that value, even if I put a resistive load across the output.
Is this just a product of the LM741, or have I done something incorrectly?