Let me first start by clarifying that I'm no electronics expert - and so there will likely be some fundamental things I'm not accounting for in this post, however, I'm hoping that someone can help me achieve what I'm trying to do! So... I have a fondness for Beolit transistor radios which comes from growing up with one in the family home, and have acquired a few over the years since. A year or so ago I had an idea of attempting to put together a bluetooth module from off the shelf parts that I could install (but be reversible) within the body of a Beolit with an external source input (a Beolit 1000 for example). After a period of searching and trial and error I created a rough solution which sort of works ? – a small step down power supply converter (from 7.5v to 5v) connected via the on/off switch (so the bluetooth board only uses power when the radio is *on*) – this then feeds a 5v bluetooth 4.1 board (took a while to find one that powers up in receive mode!) – the audio output of which is connected to the corresponding DIN input pins Well that's the theory - however, when I tested it on a Beolit 600 (using internal D cell batteries) as soon as I initiated streaming the sound from the radio just died away. Again I mention I'm not an electronics expert but I'm guessing that the current that is being drawn is too much to power the actual radio in addition to the ps and bluetooth board. I've subsequently tried a Beolit 1000, powered with an external 7.5V 1000mA DC input, and this successfully allows me to stream from my iPhone and hear the music. Success? Kind of, however, I'm getting *noise* in the background of the audio signal. As this is absent if I power the ps and bluetooth board via an external source I'm guessing it's related to how/where I'm pulling the power from internally. I'd love to get this all working and give me a new way to use my old Beolits but could use some sage advice! Where am I going wrong? Is this ultimately achievable? Thanks!