I have attached a schematic of a project that I am working on, it is following a design that has already been done and works well. My problem is regarding V7. now the schematic below works perfectly when V7 is a DC source of the required voltage, in this case 0.039V. But the actual source of V7 is from a microcontroller, which sends 12 bits to a DAC, which then outputs a voltage which is what V7 is simulating. My question is, wouldn't the output from the DAC be an AC waveform? However when I replace V7 with an AC waveform it doesn't function properly at all. Actually, the AC signal can work but only when the frequency of it is equal to 1Hz. what am i missing?
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