I tested the bluetooth FM transmitter

Some car radios do not have bluetooth and have no jack, it is impossible to listen to the music of his smartphone on his car. Finally, it is without counting on the bluetooth FM transmitter, this small box that allows transmission by radio waves. Here is my test & #8230;

The FM transmitter is a small box that feeds most of the time through the cigarette lighter socket. We find some fifteen euros on the market. The principle is simple, you connect your smartphone to the FM transmitter via bluetooth or cable and the transmitter emits a radio wave that you can then receive on the car radio.

Setting up the FM transmitter

The set up is very simple and fast. There is no need to be a genius to get there. Here are the different steps:

  • connect the transmitter to the cigar lighter
  • switch on or start the engine so that the FM transmitter turns on
  • connect the smartphone to the transmitter via bluetooth or cable (see details in the photo below)
  • set the car radio to the correct frequency (see details in the photo below)
transmitter fm block diagram

Functional diagram of the FM transmitter

Audio quality

With all this DIY to have music on his car, we can ask what is the final sound quality. The result is rather conclusive, but let's break it down in two steps:

Quality of signal reception

When the entire device is operational, ie the phone (music stopped) is connected to the FM transmitter and the car radio is set to the frequency of the transmitter, we have a white (or silence) full. We have no sizzle or anything. It means that the reception is good. At the same time the transmitter (the FM transmitter) and the receiver (the antenna of the car) are very close. When we start a music we do not get any sizzle either. Conclusion: the reception is perfect.

Sound quality

We are now launching a music to test its quality. The sound is almost as good as that of an audio CD. To improve the sound quality, here are my recommendations:

  • increase phone volume to the maximum
  • set the one of the transmitter to 2/3 of the maximum
  • then adjust the one of the car at a good price

Note: Despite these two positive points, we are not immune to interference on the road, as well as the reception of radio stations.


This device has given a second life to my car and cheaply. For a device as inexpensive, I find it very complete since my model accepts bluetooth, cable jack and micro SD memory card.

The model I ordered: https://www.amazon.fr/gp/product/B06XZ63KY3 That said there are many other interesting models, do a search 😉

To see also: Blu: the free mobile package 100%

About the Author

I am very interested in technology, music, environmental issues, and various other subjects. By developing the Current Trends blog, my goal is to share with you my knowledge, my discoveries and my tips on the various subjects that fascinate me. Leave me comments, it helps me to improve myself and it makes me happy: D

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