Download Fm Radio Without Earphone

[Alayna Rother]

Regardingthe original question, using the radio without headphones was possible via an Xposed module. Listening to radio right now on my Moto G5 Plus potter with LOS 14.1 Unofficial sans headphones. Also works on my G5s Plus sanders running Oreo. Picky in how I hold it or where I place it.

Listening to FM Radio on our Mobile Phones Always needs headphones. And especially indoors, the reception can be quite bad. So here's how to build a Simple Antenna to listen to radio without headphones. As a benefit, they also greatly improve reception indoors.

Depending upon the radius of the antenna, you may have to thin the outside black part of the jack and insert it straight into the antenna as in the picture. I have used an expandable antenna. You also have to be careful that the copper wire touches the edge of the antenna. For that, just fold the Copper wire towards an edge and push it in the antenna. It doesn't matter if it touches or not, but indoor reception has been great for me if it touches.

You can see in the image that the radio doesn't work without headphones, but as soon as I plug in the antenna, it thinks of it to be a headphone. Also, you must select the speaker mode to get the sound out of the phone speakers. Look here and there, it's pretty easy to find.

Radio suggests the act of sending energy from one place to another without any form of direct wired connection. Radio waves move from one piece of equipment called the transmitter, travel through the air wirelessly, and are then collected by another piece of equipment called the receiver.

It goes something like this. First, you capture sound energy from a recording or a voice, and then convert it into electrical energy. This energy then flows into a tall antenna that boosts the strength of the electric energy. You can control this boosting process depending on how far you want the signal to go from the location of the antenna. The electrons in the electric current become agitated and start moving back and forth to create invisible electromagnetic radiation in the form of radio waves.

These waves then travel at the speed of light to the receiving antenna. This in turn converts the radio waves back into electric current. The sound energy is then decoded from this electric current to grace your ears with the sound of radio music!

If you see modern transistor radios, they usually have two different antennae. One antenna is coiled inside of it, while the other is extended externally. Why do we need two separate antennae in the first place?

This is because radio is usually emitted in two frequencies. One is the frequency for AM radio (Amplitude Modulation) and the other is the more popular FM Radio (Frequency Modulation). The main distinction between the two is that FM radio waves travel a short distance, but at a much higher frequency (around 85- 100 MHz), while AM radio utilizes waves that travel a greater distance at a much lower frequency (around 1000 kHz). Therefore, FM signals have freqencies that are 10 times greater than their AM counterparts!

A single antenna cannot pick up both of these highly different frequencies. It is the frequency of the radio wave that determines the length of the antenna. Basically, a greater wavelength means a longer antenna. For example, to catch an FM signal, you need an antenna that is roughly 90 cm in length.

However, with the current level of technology, is it not possible to have an internal antenna instead of relying on headphones? To be honest, the technology does exist. There are several phones that give you the option of listening to FM radio without the headphones, but most phone companies opt out of it.

I am building a crystal radio for my science fair project, and I am having some issues. For my earpiece, I am using a telephone receiver which may be the issue. For my ground, I am using a water spigot in my backyard which is completely metal. My diode is a germanium diode, which works. My coil is a bottle wrapped in enamel coated magnet wire that is between 18 and 22 gauge. Instead of sanding a section of the wire and using a wiper blade, I have taps with the enamel sanded off. I have tested all of my parts with a voltmeter, so the circuit isn't the issue. Any advice? What might I be doing wrong?

Crystal radios need a high-resistance earphone. This is the type that produces tiny sounds when driven by several volts, while only drawing a few hundred microamps. For AC signals it appears to be a large resistor, 5K or higher.

Yet the RF signal from a crystal radio must be high voltage at low current, so it can well exceed the 0.3V detector voltage. It's designed to produce few-volts DC output, not few-tenths. A standard earphone will just short out your receiver, and won't convert very much of the DC output into sound.

There of course is a simple cure. Connect a small audio transformer to your earphone. You want to step down the few-volts output by a factor of 20 to 50, converting 8ohms into many Kohms. Small transformers like this are available, called audio matching transformers, or audio output transformers for old-style transistor radios. Connect one of these to your tiny earphone, so the high-volt, high-ohms side connects to your crystal radio output.

The above will work, but unfortunately this transformer uses up some energy (as wire heating,) as does the coil in your earphone. A piezo-crystal earphone is far more efficient than a coil/magnet earphone.

So, for the same milliwatts of EM energy being received by your radio, a crystal earphone will sound distinctly louder than a coil earphone, even if exactly the right audio transformer is being used. The missing audio ends up as coil-heating.

I doubt that a telephone receiver is sufficiently sensitive to work with a crystal radio. It needs a significant amount of power to operate, which you cannot get from a crystal radio. You will have to use a crystal earpiece, such as this.

the problem is the lack of power, a crystal radio draws its power wirelessly from the signal that it's receiving. Regular speakers require quite a bit of current to operate (and a reasonable voltage - hence high power). So unless you have an antenna the size of a house, it's probably not going to collect enough energy to drive a regular speaker. Crystal earpieces need almost no power to operate (they also need almost no current - which is the harder to generate anyway), that's why they're used, because a regular crystal radio only generates enough power to drive a crystal earpiece. If you had a large enough antenna you could power a full hifi system, but the antenna would be impractically large. If you're interested in working out roughly how much power might be available, measure the voltage at the speaker (with the speaker disconnected) using the AC volts range, then measure the AC uA, multiply the two and that should give you a rough idea of how many microwatts you've got to play with

The heart of the crystal set (as in any other radio receiver) is a parallel tuned circuit. This parallel tuned circuit is attached to the antenna and the antenna behaves like a very short dipole. This means it looks like a capacitor to earth from the perspective of the tuned circuit.

Why does it behave like a short dipole - at 1 MHz the wavelength is 300 metres and half of this is 150 metres and, does your xtal set antenna have an antenna this long? Almost certainly not because nobody has that amount of space.

Xtal earpieces that I've seen have an impedance quoted at about 20 kohm so there is some loading but, it's not that bad if the tuned circuit is designed/built correctly. Some loading is actually required to avoid selectivity value that excludes the full spectral width of the station being received.

The DT-120 features 15 preset stations (5 AM / 10 FM), auto scan, and includes stereo earbuds. It runs on two AAA batteries (not included) with a low-battery indicator on the LCD display offering a friendly reminder for battery replacements. The 90-minute auto shut-off also lets you fall asleep to the radio without worrying about waking up with drained batteries.

Because the books and radio shows that she listens to make me uncomfortable but I did not feel comfortable trying to dictate to her what she could and could not listen to, I decided to simply listen to the things that I enjoy on earbuds. Plus, listening to my own stuff helps me concentrate. I only listen to my stuff loud enough to be able to hear it above her radio and the other noise of the office but not so loud that any other noise is drowned out, as I do know I need to be aware of things going on around me.

This problem started, I think, when you tried to be accommodating to Jane and, rather than ask her to use headphones to listen to her preferred stuff (which is a completely reasonable thing to request, and not something she should even need to be asked), you decided to try to block it out.

The petty part of me says that if your boss doubles down on the headphones and refuses to tell Jane not to listen to her things, that you should just start listening to your stuff without headphones too.

In the mean time, you might want to queue up some Metallica (Master of Puppets would seem to fit here) whenever her political talk radio comes on, and crank up the volume. Petty? Yes, but appropriate, IMO.

My mother does this with any media she can hear, and I can confirm that it is HIGHLY ANNOYING and makes me turn off the media 100% of the time. The more aggressive and off-topic you can be, the better. I also recommend latching onto a random word which reminds you of a song, which you can then sing, off-key, in full. Joy for all!

Have you tried a bone conduction earphone? I use one over one ear as a receptionist/admin. assistant (which means I have to concentrate on paperwork while listening for a phone to ring and I hate the radio stations they were picking up on the office radio) and it not only leaves me free to hear what is going on but also to hear what I am listening to clearly over all sorts of industrial sounds.

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