Playing (Having Fun) With Junk!

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I need some advice..

I'm messing with an old car Cassette/AM_FM in dash unit. I'm "Trying" to interface a Bluetooth receiver to it through the audio cable that is (was) connected to the play back head. I have the function switch from radio to tape figured out BUT having major issues trying to get the Bluetooth output to work well through the head input.

The pick up head(s) has a resistance of ~300 ohms per channel. I have tried loading the input down via resistors and isolating with capacitors. Added an isolation transformer between the Bluetooth and the input but.....

Help Me!! I'm missing something..
 
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This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.