• LED Acoustic Flasher

    On the Internet, there are many different LED flashing patterns — simple, complex, with and without microchips. But now you won't surprise anyone with the usual flashing LED, so there is a need to collect something more advanced. For example, an acoustic flasher - a microphone picks up the sound and turns it into LED flashes. The diagram is presented below.


    LED acoustic flasher
    The diagram has an electret microphone that turns sound vibrations into electrical ones. You can find it in the broken phone headsets, or in the store of radio components. Transistors T1 and T2 amplify the signal in such a way that it is enough to ignite the LEDs. You can use almost any low-power n-pn transistors, for example, BC547, KT315, KT3102. The LEDs are used the usual 3 volt of any color, you can put two pieces, as indicated in the diagram, but you can and more.Capacitor C1 is used to suppress power supply ripples, its capacity may be in the range of 10-100 microfarad. Supply voltage of the circuit from 3 to 5 volts.
    LED acoustic flasher

    Assembly of the flasher

    The circuit is assembled on a miniature printed circuit board with dimensions 45 x 15 mm, which can be done using LUT method. The printed circuit board is completely ready for printing, you do not need to mirror it. Please note that the board is designed for the installation of transistors BC547, when using similar transistors with another pinout, you will have to swap their outputs on the board. Below are some photos of the board manufacturing process.
    LED acoustic flasher
    LED acoustic flasher
    It is desirable to tread the tracks, this will protect the copper from oxidation and facilitate further soldering of parts. First of all, small parts are installed on the board - resistors, transistors, and only then capacitors and LEDs. To connect the power wires, it is most convenient to use a screw terminal block.When installing a microphone, it is imperative to observe its polarity - the minus leg of the microphone is connected to its metal body, it must be soldered to a minus circuit. After the assembly is complete, remove the flux residues and check the correct installation. -08 / medium / 1535713124_foto-4.jpg "style =" max-width: 100%; " alt="LED acoustic flasher">
    LED acoustic flasher

    Setup and testing

    We supply power to the board and watch the reaction of the LEDs - they must be completely extinguished in the absence of sound. If the LEDs are lit continuously, then you need to increase the resistance of resistors R2 and R3 1.5 - 2 times, until the LEDs go out, this is the only setting of the circuit. After that, the LEDs will flash instantly, if any sound, cotton, click or even music is heard nearby. When using a sensitive microphone, the sound detection range is approximately 6-7 meters. The scheme will be an excellent toy for children - after all, watching how the LEDs light up at the slightest sound is quite fascinating. Also, the circuit can be used to test the sensitivity of electret microphones.Successful build.

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