Stereo FM Transmitter from MP3 Player
Not so long ago, a Chinese manufacturer has developed this device for the lucky owners of cassette recorders, who do not have enough money to buy a normal MP3 player. Cheap and cheerful - costs relatively cheap (I took it for $ 200), while it has several advantages including a remote control. It's simple: put in the cigarette lighter, stuck a USB flash drive with your favorite music, tuned the radio to the frequency of the transmitter and that's it! Klakay with the remote without touching his hands from a distance. I do not have a car, but I decided to use this little thing in my own way. Like a stereo transmitter. Why do I need this? And in order to broadcast the sound from the laptop to the stereo system. The fact is that I like to watch movies on the big screen, on the projector. I connect the video from the laptop to the straight line, but in order to connect the sound you need to pull a long wire to the center. So that this was not, I decided to get rid of the wires in my own way.Bought, disassembled.Having made a peculiar heap of details.Sharing a device in two parts: a small board is a stabilizer. It reduces the voltage to 5 volts and accordingly stabilizes it. Three wires go to it: two power wires and a third antenna (white in color). The big board with the display is the MP3 player itself.All three wires are unplugged from the mainboard. For the place of the antenna wire we solder a longer wire to increase the transmission radius. We take the USB adapter and solder the power from it to the board as shown in the picture.Next we connect the sound to the transmitter. Find the transmitter chip. To him through two chip - capacitor sound comes from the processor. Remove these capacitors, I just gently knocked them down with a screwdriver. The work is painstaking. To the output of the chip solder two capacitors with a rating of 0.01 ... 0.1 μF and give them sound. We take the common wire from the minus board.That's all. It would be nice to add a divider of resistors to each input, say 1: 2, and then the output of the laptop is more high-voltage than necessary. But then I understood it.We close, check. It works!
Very convenient! Our transmitter is also powered by a laptop. The quality of course is not like a wire, but rather decent. Now, with the remote control, you can only blame the transmitted frequency, the rest has lost its power. I think there is nothing difficult here, anyone with little effort will do it himself without important problems.
How to change the prefix
How to make coffee ice
Simple bottle case
Where can I have a good rest with my family in Yaroslavl