This modification improves the transmission range and remove the 'feature' of auto-power down when no audio signal is present. It certainly sets you up as resident pirate radio DJ of your block and allows you to jam the loud radio listener on a bus or train! Please note that this is a rehash of something that was done before 'instructable' came along. No more the delay now for the good stuff! Those ever efficient Taiwanese manufacturer manage to secure this piece of gadget with just a single screw, if you're handy with a screwdriver, that's the job done!
The first image shows the location of the screw ignore the switch for the moment, that comes later , the second one shows where to a gentle pry will open it, note the plastic latch.
Not to boost the power, more like removing the attenuation. This step involves a bit of handy soldering which may be a bit tricky. Should you dare proceed, the procedure is easy enough, simply bypass the tiny inductor. If you refer to the previous step, you would have notice a blue wire soldered to the PCB via hole, conveniently labeled 'ANT', remove this and stick it directly to where the black wire is on the photo below, the inductor can be left connected to one end, just in case you wish to revert the changes.
Now if you wish to take it further, get a telescopic antenna! I have devised a neat way of attaching the antenna, see second photo. If you live in the UK, Maplin Electronics www. Yup, the TuneCast has a really weedy short audio cable, not very nice if you decide to place the FM transmitter by the window, so your neighbor 4 floors down can listen to your collection of the latest break-beats! The solution is to replace the stereo plug with a plug that is small enough to still fit the TuneCast package.
The photo below shows the new stereo plug add-on feature, if you're doing the modification, do note the correct channel, refer to the photo in step 3 for the correct connections. A brief description: The white wire is the 'tip' of the plug, which is the left channel, the yellow wire connects to the 'ring' or middle bit of the plug, which is the right channel, the black wire is the ground. Suitable stereo socket can also be found in Maplin Electronics.
Basically the TuneCast automatically power down when there's no audio signal for about a minute, this is great since the number of transmission channel is limited, not so great when you are flipping through your 60GB of music selection looking for right song and then a blast of static comes on! This step is a bit trickier, it involve adding a switch, a resistor and some wiring.
The idea works by biasing up the bit that turns on the TuneCast when a audio signal is present. Although the transmitter is battery powered, many of the ICs on the device requires a higher operating supply voltage, this is done with a boost converter, boosting its internal supply to around 5V, where it is kept permanently 'on', which partly explain why your TuneCast is dead after a few days even if you're not using it, pretty dismal, but great for this modification! Note on the photo below, the two point in which the wires are attached is where you need to modify incidentally, this is at the top right end of the PCB, on the LCD side.
The second image is a drawing of the circuit connection. As promised, with this feature allows you to 'swamp-out' a typical commercial FM station within 2 to 3 meters of the transmitter and enjoy the peace and quiet.
Not dramatic but enough to convulse the listener into fiddling with the radio tuner. Now that you have done the tricky bit, here's the horrible bit! Wedging a tiny switch into the TuneCast casing. With a fair bit of filing and drilling, the end result is show in the photos below.
To take it further, you can make a plastic clip mount with a mini-camera tripod and you have your own FM base station! I know it's a bit late for asking something about your tutorial.
For 40 bucks, we expected better performance from the TuneCast II. Reception was unacceptable in the metro areas of San Francisco and Los Angeles; even open frequencies proved to be riddled with static when used with the transmitter. The device fared better in the rural and suburban areas lining Interstates 5 and We found a couple of frequencies that seemed to stick with little or no interference along the entire drive between Los Angeles and San Francisco. Still, sound quality was typically poor--AM radio at best--but that's to be expected from an FM transmitter.
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See more languages. Share the Article:. It uses your GPS location to find the best FM station in your area and recommends open stations based on what other people in your area are using. Step 2: Connect your TuneCast Auto to the cigarette lighter or power outlet in your vehicle. Was this support article useful?
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