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It’s easy to upcycle old cassette boom boxes into general purpose amplified speakers. Cassettes are mostly obsolete and there are plenty of working used cassette players available for almost nothing. I recently picked up a portable karaoke cassette player for $1 at a yard sale. The seller apologized that the microphone wasn’t working anymore, so it would only play cassettes, but that was fine by me.
With a car stereo the adapter’s cable comes out of the front of the unit. It’s slightly trickier with a boom box since there’s no opening for the cable. In most cases you can just squeeze the cable through the opening without any problems. In others you may have to notch a hole in an appropriate place for the cable to pass through.
Cassette adapters must be inserted right side up. As a normal rule it’s the side with the label.
All you have to do is press play on the cassette player and you’ve got an amplified speaker.
Step 3: What Can You Use It For?
Check out the complementary instructable, reusing computer speakers, for another approach.