I'm using an LM741 as an active low-pass filter. Non-inverting input with output capacitor feedback between two series resistors. This works fine with unity gain (output tied back to inverting input). However, if I try to increase the gain using a resistor divider to feedback to the inverting input, I stop getting any output (however, if I remove the inverting feedback completely, I seem to get an extremely large gain).
Any ideas on what's happening.
TIA.