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Help adding Bluetooth to early 2000s hifi stereo

crazyfrog
By crazyfrog
in Audio
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Can someone help me I've got a phlips fw-c120 I'm trying to add a bluetooth receiver(csr8645 with integrated b1203s DC/DC converter). I intended to add the bluetooth modules audio output to input side of the source selector but after adding it here on the seems to add a lot of background noise, I'm assuming this is due to both the DC/DC and the rest of the circuit sharing the same ground signal.

I did find this C100 service manual which mine seems to be a cut down version of that shows the source selection circuit on page 71

https://www.vintageshifi.com/repertoire-pdf/pdf/telecharge.php?pdf=Philips-FWC-100-Service-Manual.pdf

Any suggestions to sort the background noise please?

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