I tested the bluetooth FM transmitter

Some car radios don't have bluetooth and don't have a jack, so it's impossible to listen to music from your smartphone on your car. Finally, it is without counting on the bluetooth FM transmitter, this small box which allows transmission by radio wave. This allows you to transform your old car into a connected car. Here is my test...

The FM transmitter is a small box which is powered most of the time by the cigarette lighter socket. You can find it for about twenty euros on the market. The principle is simple, you connect your smartphone to the FM transmitter via bluetooth or by cable and the transmitter emits a radio wave that you can then receive on your car's radio.

Setting up the FM transmitter

The installation is very simple and fast. You don't have to be a genius to do this. Here are the different steps:

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

Functional diagram of the FM transmitter

Audio quality

With all this tinkering to have music on your car radio, you may wonder what it has to do with the final sound quality. The result is pretty good, but let's break it down into two steps:

Quality of signal reception

When all the device is operational, i.e. the telephone (music off) is connected to the FM transmitter and the car radio is set to the transmitter frequency, there is a blank (or silence) full. We don't have a crackle or anything. This means that the reception is good. At the same time the transmitter (FM transmitter) and receiver (car antenna) are very close. When you start a music you get no crackling either. Conclusion: the reception is perfect.

Sound quality

We now play a music to test its quality. The sound is almost as good as that of an audio CD. To improve 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, you are not immune to interference on the road, just like receiving radio stations.


This device gave a second life to my car radio and at a lower cost. For such an inexpensive device, I find it very complete since my model accepts bluetooth, jack cables and the micro sd memory card.

The model tested in this article is no longer made, but the principle remains the same for all FM transmitters, to replace it, I suggest a model from the LENCENT* brand. That said, there are plenty of other interesting models, do a search 😉

*this link is an Amazon affiliate link. This allows us to earn a percentage of purchases made through that link without changing the price you pay.

About the Author

Picture of Romain Royer
Romain Royer
I'm very interested in technology, music, environmental issues, and various other subjects. By developing the Current Trends media, my goal is to share with you my knowledge, my discoveries and my tips on the various subjects that fascinate me. Leave me comments, they help me improve and are always appreciated.

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