It seems not a week goes by before someone is asking for information on how to connect an ipod to a boombox that otherwise does not have this capability. Most of these boomboxes are simpler starter type boxes that never offered that as a feature. In reality, it amounts to purposefully "dumbing down" a boombox since the actual cost to add this function is very low.
There are different methods to add this function. One of the ways offered or performed by other members is to tie into the radio circuit by installing a 2P switch to change from radio to externally mounted phone jack.
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For those that wants to add LINE-IN, here is a way to do it in a simple manner, with a bare minimum of parts.
All you need to do is find the tuner L/R and ground signal wires.
By using the the proper jack, you can add this feature without using any other parts. You don't even need a switch.
Basically, install a switched 1/8" stereo phone jack (or convert an existing unused one) and you are done.
The jack is switched, meaning that when you stick a 1/8" stereo phone plug into the jack, the jack switches out the radio signal and ties the phone plug into the circuit.
THAT'S IT! As far as your boombox is concerned, it's playing the radio. But in reality, the audio signal was switched out for the external source.
Just make sure you use the right jack.
Here is a sample jack.
http://www.switchcraft.com/Drawings/35rapc__h3_cd.pdf
OK, I've planted the seed, and shown you the way. Take this information and go have some fun. The rest, you can figure out and if you can't, then maybe this project isn't for you.
There are different methods to add this function. One of the ways offered or performed by other members is to tie into the radio circuit by installing a 2P switch to change from radio to externally mounted phone jack.
=======================================
For those that wants to add LINE-IN, here is a way to do it in a simple manner, with a bare minimum of parts.
All you need to do is find the tuner L/R and ground signal wires.
By using the the proper jack, you can add this feature without using any other parts. You don't even need a switch.
Basically, install a switched 1/8" stereo phone jack (or convert an existing unused one) and you are done.
The jack is switched, meaning that when you stick a 1/8" stereo phone plug into the jack, the jack switches out the radio signal and ties the phone plug into the circuit.
THAT'S IT! As far as your boombox is concerned, it's playing the radio. But in reality, the audio signal was switched out for the external source.
Just make sure you use the right jack.
Here is a sample jack.
http://www.switchcraft.com/Drawings/35rapc__h3_cd.pdf
OK, I've planted the seed, and shown you the way. Take this information and go have some fun. The rest, you can figure out and if you can't, then maybe this project isn't for you.
I see this same concept applied to those old 2-pole GM/Delco radios for the guys who want to keep it stock but still have line-in capability. 
