Hello everyone! First post on the forum here, excuse any bad etiquette I may have
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My class's end-of-semester project is to build something involving opamps. I've decided to build a theremin, and I've been plotting it out on ltspice. I used an opamp (U2) to prevent the speaker from pulling any significant current from the frequency generator, but even then, there's only about 0.3 volts going across the speaker. I'm assuming that the speaker has 4 ohms of resistance and 0.2mH, after some brief googling on the average speaker. Attached is the .asc file.
![](https://i.imgur.com/4aEiWX8.png)
How would I get more power going through the speaker so I could actually hear the tone that's being produced?