Omnipresent Audio…

August 31st, 2013

Reached a milestone with my 500mW transmitter project today so I can control the audio around the house. It works well and is very stable based on the BH1415 FM transmitter IC, the type used in these crappy FM transmitters used for plugging your MP3 player into a car stereo… Somewhat superseded by a hundred different other configurations nowadays, it has a 3 stage RF power output which should technically be quite efficient. Need to design a small antenna now, may have a go at etching one onto a PCB if I can find any info on the subject. My original idea was to build it into an aluminium cast box and design in feed through points for power and line inputs and have a 50 Ohm BNC antenna output and inductively load a short antenna similar in length to the 802.11 types of old, this now seems a tad O.T.T. and if I am going for the internal antenna design, a rethink will be required. Chucking it all in an ABS box with a bit of spray plating may well be the way to go, or fitting the ally module into a plastic case… Hmmm

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