Adding AUX-IN to my "boombox"
23/04/17 20:30
We've got an "old" Sony CFD-S350 portable radio/CD/tape player (i.e. a "boombox"). So it doesn't really get much use any more - but if it had an AUX-IN then we could hook our MiniDisc or iPhone … or anything … and still use it.
Pulling it apart …
Disconnecting the flat flex connecting the CD unit and button controls from the main controller board
Removing the tape unit and speakers to reveal the radio tuner board …
I still want to play the occasional tape and CD … but I don't really listen to radio, so let's see if there's something there I can use …
(I've noticed that the Japanese use the Icelandic letter Ð instead of just plain D … makes sense as it prevent confusion with the letter O or digit 0!).
So there is a left & right channel coming into the main controller board (and amplifier I assume) that I could connect my AUX-IN to!
This is the radio tuner board with the flat flex connector on the right.
The IC is a Toshiba TA2149-series … and the data sheet tells me these are the R & L channel outputs:
Following the trace confirms that they run directly to the flat flex connector with nothing else in the way:
I found the service manual for the CFD-S350 and noticed that there are two 0Ω resistors being used as links … so I could simply remove them, disconnecting the decoded audio from the radio tuner chip and hook my AUX-IN socket:
Careful …
Now hooking in my AUX-IN socket …
Drilled a hole in the side of the case for the socket and put everything back together:
New life/use given to this still-working-fine piece of equipment!
Bonus point … there's a 2Kbit CAT24WC02 serial EEPROM on the the underside of the main controller board … IC805, top right … that uses the I2C bus. I wonder what's on it … ? Maybe I could use an Arduino to read the contents?
Pulling it apart …
Disconnecting the flat flex connecting the CD unit and button controls from the main controller board
Removing the tape unit and speakers to reveal the radio tuner board …
I still want to play the occasional tape and CD … but I don't really listen to radio, so let's see if there's something there I can use …
(I've noticed that the Japanese use the Icelandic letter Ð instead of just plain D … makes sense as it prevent confusion with the letter O or digit 0!).
So there is a left & right channel coming into the main controller board (and amplifier I assume) that I could connect my AUX-IN to!
This is the radio tuner board with the flat flex connector on the right.
The IC is a Toshiba TA2149-series … and the data sheet tells me these are the R & L channel outputs:
Following the trace confirms that they run directly to the flat flex connector with nothing else in the way:
I found the service manual for the CFD-S350 and noticed that there are two 0Ω resistors being used as links … so I could simply remove them, disconnecting the decoded audio from the radio tuner chip and hook my AUX-IN socket:
Careful …
Now hooking in my AUX-IN socket …
Drilled a hole in the side of the case for the socket and put everything back together:
New life/use given to this still-working-fine piece of equipment!
Bonus point … there's a 2Kbit CAT24WC02 serial EEPROM on the the underside of the main controller board … IC805, top right … that uses the I2C bus. I wonder what's on it … ? Maybe I could use an Arduino to read the contents?