So.........For This Weeks Small Project:

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Nickeccles

Member (SA)
I've been thinking over the last week or so, how can I transmit Bluetooth audio as well as line level audio in stereo around my medium sized flat

Now I bought one of those FM transmitters back in 2015 that had a claimed 15 to 20 mile radius if placed up high enough!

These only have a line in facility though & as it turned out they also cause interference to just about everything - Spurious emissions that knocked out my Wi-Fi, Freeview TV & Freesat, so I quickly decided I wouldn't be using it at all as it would be doing the same next door & flats upstairs too!

Not only that, the signal was indeed so powerful it was overloading the front end of the tuners in many of my boomboxes to the extent that the results were terrible!

I've been thinking over the last week or so, how can I transmit luetooth audio as well as line level audio in stereo around my medium sized flat!

I have a cheap device in my car that allows Bluetooth audio & handsfree calling that simply plugs into the cigarette lighter socket & allows me to use the existing Tuner/CD player without messing with the car stereo at all! Car comes with factory fitted JBL speaker systems front & rear & they are simply excellent so with a decent factory stereo in perfect working order, this little device is perfect!

A couple of days later & another similar device arrived along with a car cigarette lighter socket - I chose to keep it as simple as possible after the expensive transmitter mistake in 2015, cheap as well so I had nothing to lose!

I have a new unused 10 Amp high quality regulated power supply doing nothing but sitting it's box!

This is a beautiful supply & it's 13.8 supply is overkill for such a tiny device but as I had it already was the reason I chose this route!

With all the gubbins in front of me, it was definitely time to break for a hot sponge pudding You can't beat that Dr Kipling

Pudding digested & energy levels up, out came the soldering iron & some thick gauge red/black cabble it took just a few minutes to extend the somewhat stingy caable from the new socket to a decent length using heat shrink wrap to cover the soldered join!!

Mount the socket part on the upright poles of my corner shelves, connect the power supply up & perform tests!!

I almost tripped over my perch

The results were just excellent in all the rooms, even the little Fisher/Sanyo mini Hi-Fi in the bedroom which is through 3 walls was able to pick up hiss free FM stereo! Result!!

& of course all my beloved boomboxes (I hate that word!) can now easily tune in to 94.4 FM & produce lovely stereo sound.........

I have a cheap device in my car that allows Bluetooth audio & handsfree calling that simply plugs into the cigarette lighter socket & allows me to use the existing Tuner/CD player without messing with the car stereo at all! Car comes with factory fitted JBL speaker systems front & rear & they are simply excellent so with a decent factory stereo in perfect working order, this little device is perfect!

Oh yeah: I paid £16 for it & cigarette adapter was £2!

Naturally I am up over the moon with the end result.........

I can now listen to "Orange FM" easily & effectively!!

Et Voila:

4K video here as Youtoob have caught me out just like a kipper & refused to let me post so go here:


https://1drv.ms/v/s!ANEYKw-3GKK-gqwA


Radio W'Orange FM - 29 May 2019.jpg
 

hopey

Member (SA)
This reminds me of the guy who hooked up his entire home to PABX. You could dial from any handset to open the front door. Just had to remember the extensions for every action.

Top work.
 

Nickeccles

Member (SA)
The transmitter is here:

https://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItemVersion&item=133050560448&view=all&tid=1586918555003

The power supply is a bench type 10 amp unit often used to power a mobile CB radio/Stereo indoors although they were typically only 3 to 5 amp!!

The adapter here connects to the Psu terminals & you just plug the bluetooth transmitter into it as you would in a car.......................

https://www.ebay.co.uk/itm/12-24V-2A-Female-Car-Cigarette-Lighter-Socket-Plug-Connector-Adapter-Cable-NDIU/264334153401?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649

That's it really, just very simple & effective! :yes:

I would point out that a decent power supply is essential to avoid any hum or ripple filtering through to the module!
 
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