Quote:
Originally Posted by Kevin Sevcik
Sending something like this through a speaker isn't particularly nice. Especially if the 0V side isn't 0V, as then you'd be constantly sending a current through the speaker. So you'd need an op-amp circuit to shift the square wave so it oscillates around 0V.
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You can block DC current by putting a suitable capacitor in series with the speaker. That's not always a perfect option, but it's certainly a lot easier, cheaper, and quicker than adding active circuitry that requires a bipolar power supply.