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Originally Posted by duncanlowe
That little one isn't a speaker. It's a buzzer. Which is why it buzzes when fed DC. A speaker would just click once.
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Indeed.
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...Your small buzzer with the red and black wires is an active one, and not suitable...
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Just to recap, the simplest schemes for sound from a PET have one of the digital outputs driving a high impedance Piezo sounder (no buzzer) through a resistor. Colin does not currently possess that type of sounder. The digital output in question does not have enough grunt to be able to drive a low impedance / magnetic sounder directly but I think it should be able to drive the inputs of a set of active / powered PC speakers provided their input termination resistance is not too low.