Tech Tear Down: CD/Radio/Cassette Boombox

It’s been a good long while since I’ve really dissected a bit of electronics. But I finally got another chance after uncovering an old broken CD/radio/cassette player in the basement! After some tests, I determined that the CD player part of it didn’t work. Since no one uses archaic cassette tapes anymore, and a radio that weighs ten pounds is pretty impractical,  I naturally snapped it up to tear it apart. 🙂

boombox before teardown
The boombox before dissection; note that it’s quite dusty. It was manufactured in 1997 so it was about 20 years old.

Disassembling it was pretty trivial. There was only a few screws which held the casing together, and each internal part also held in place with screws. The most challenging part was removing the large speakers. Each was both glued and screwed, so it took a little extra prying to get them off.

The boombox can be powered from both batteries and the house current, so there’s both a transformer and a large compartment to hold eight D cells. There’s one large PCB that combines the circuits for the CD player, cassette player, and radio player, with a few offshoot PCBs to connect the controls.

I was able to salvage some good parts:

  • x1 2-digit 7 segment display
  • x2 DC motors (they’re rather weak)
  • x2 8Ω 3W speakers
  • x1 microswitch
  • x1 large potentiometer
  • x1 fancy radio-tuning gear
  • a few plastic casings for switches and knobs
  • various wires and connectors

Check out the following images of the torn-apart boombox.

Major parts of the boombox.

plastic casing of boombox

tape player part of boombox

closeup of cd player_boombox ttd

bottom half of main pcb_whole radio

closeup of cd player controls

This is one of the large speakers I salvaged.

main pcb of boombox

closeup of radio tuning pcb

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