16-02-2025, 03:38 PM
Thanks so much for the replies, and yes, thoughts about inserting pictures noted! I'm still finding my way around the technicalities of the site and its capabilities. The insert photo icon failed to behave as expected when I posted, so I'll read the manual!!!
I've experimented a lot with incorporating Bluetooth into radios, and I find that any problems usually have their origin in the power supply and the grounding (signal and d.c.). That's why I use a USB buck convertor as a reliable and cheap, stable power source. But it has to be floating to avoid a whole world of hurt (low-level buzzes and whistles). I mostly use an isolated buck fed from the heater windings via a voltage doubler or trippler (to be reliable, the buck module needs around 12V minimum). The buck used in this build is not isolated, hense the transformer to achieve the isolation. The transformer is one of many I recovered from redundent emergency lighting units where it maintained the backup batteries.
I've experimented a lot with incorporating Bluetooth into radios, and I find that any problems usually have their origin in the power supply and the grounding (signal and d.c.). That's why I use a USB buck convertor as a reliable and cheap, stable power source. But it has to be floating to avoid a whole world of hurt (low-level buzzes and whistles). I mostly use an isolated buck fed from the heater windings via a voltage doubler or trippler (to be reliable, the buck module needs around 12V minimum). The buck used in this build is not isolated, hense the transformer to achieve the isolation. The transformer is one of many I recovered from redundent emergency lighting units where it maintained the backup batteries.
