[Andrzej’s] plain old computer speakers are ordinary no more. He pulled off a fairly complicated hack which now lets him control speakers via Bluetooth. He had a set of Creative brand computer ...

You can schedule an appointment to drop off your old computers, laptops and accessories like monitors, keyboards, mice, cables and speakers. You can see the full list of items they’ll take here.

Simply crack open a pair of old computer speakers and wire the speaker leads to a relay. Use that to power an outlet and you have music controlled lights. The section at the beginning of the video ...