I have the following circuit as part of a class D amplifier:
simulate this circuit – Schematic created using CircuitLab
I couldn't get the amplitude of Vsig to display, it is ~.447Vp, to simulate a line level input. The goal of this circuit is to increase the amplitude of Vsig to 2Vp to feed into a comparator for the class d amp.
The problem is, as configured, I get no output. I initially used an LM324, and tried two of the 4 op amps on the IC with the same results. I also tried an LM1458, same results. When connected to an oscilloscope, Vout is flat, there is no output signal, not even an unamplified signal.
I checked before and after C2, and still get the same result.I'm not sure how to further troubleshoot this circuit.
Best Answer
Why are you putting +15V on the op amp + input? That will make the output attempt to center around +15V, but it can't output that much. Maybe you meant to ground the op amp + input.