UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

julie_m · 22nd Apr 2017, 4:33 am

Probably teaching granny to suck eggs, but remember the whole Bluetooth module must be treated as live once it is connected to the DAC90A (or any other transformerless set).

Try a resistor of about 10 kΩ across the Bluetooth output, which should make the input it is connected to less sensitive to picking up any stray signals. This will have to be switched out when you wish to listen to the radio. If the radio still breaks through, try replacing decoupling capacitors, and consider adding additional decoupling physically near the UBC41 and UL41.

Don't touch any capacitors in tuned circuits, unless you are prepared for a full re-alignment.

22nd Apr 2017, 4:33 am	#5
julie_m Dekatron Join Date: May 2008 Location: Derby, UK. Posts: 7,735	Re: Bush DAC 90A Conversion Probably teaching granny to suck eggs, but remember the whole Bluetooth module must be treated as live once it is connected to the DAC90A (or any other transformerless set). Try a resistor of about 10 kΩ across the Bluetooth output, which should make the input it is connected to less sensitive to picking up any stray signals. This will have to be switched out when you wish to listen to the radio. If the radio still breaks through, try replacing decoupling capacitors, and consider adding additional decoupling physically near the UBC41 and UL41. Don't touch any capacitors in tuned circuits, unless you are prepared for a full re-alignment. __________________ If I have seen further than others, it is because I was standing on a pile of failed experiments.