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Modify an outdated radio to connect to Bluetooth and hear music from a phone or computer.

Step 1: Take It Apart

Unscrew the back of the boombox so that the inside of the cassette deck is accessible.

Step 2: Prepare Bluetooth

Remove the case of a cheap Bluetooth adapter so that wires can be attached to left speaker and right speaker outputs, and ground. Solder these wires to the adapter (I used a black wire for the ground).

Step 3: Connect Bluetooth to Tape Deck

De-solder the left, right, and ground wires connecting the boombox to the cassette deck (on my device, they were soldered to the cassette reader near the bottom of the deck), and solder each of these wires to those connecting to the Bluetooth adapter.

Step 4: Finishing Touches

I fastened the Bluetooth adapter to the inside of the cassette deck where it would be accessible when the boombox is put back together and the user opens the deck. Reassemble the boombox, being sure that any of the new wires do not hinder it from closing. If the speakers are not already attached, hook them up to the boombox.

I did this on a Sony boombox but used the CD audio lines for the input. The tape input has an EQ curve based on tape type standards and won't sound right. There is 5V to power a Bluetooth USB stick. Connect the audio to the junctions of R101,102 and R201,202 through a 10k resistor. You may have to play with the value or add a DC blocking capacitor. The service manual is online. On the Sony, i had to disable CD muting but you shouldn't have to on this one.
<p>Also, how is the bt powered?</p>
<p>The Bluetooth adapter I bought is at this link, but it has gone up in price a bit to $10. I had a bit of trouble with sound quality, but I haven't yet done enough testing to be sure the Bluetooth was the problem, although it is my primary suspect.</p><p><a href="https://www.amazon.com/gp/product/B00V8SAIO6/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1" rel="nofollow">https://www.amazon.com/gp/product/B00V8SAIO6/ref=o...</a></p><p>Also, currently the Bluetooth has to be charged separately from the boombox, but I am hoping to keep working on it and connect it to the power supply inside so that it is less trouble.</p>
<p>which cheap bt adapter did you use?</p>
<p>I bought that same boombox back in the 80's.</p>

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