Chip LM324 is a precision operational amplifier and contains four independent channels. She
works in a wide range of supply voltages from 3 to 30 volts. The output current of each channel does not exceed 10 mA. On the chip can construct a set number of interesting devices.
Scheme is relatively simple indicator of the audio signal, built on a chip LM324. Because the chip contains 4 outputs, the number of LEDs for the analyzer will also be four, one for each channel. The amplifier output is connected to the input indicator LEDs will light up depending on the frequency of play, at low input frequencies LEDs will flash column. The result is a very beautiful light and music effects.
For best effect, you can use two chips, then it will be able to use 8 LEDs, we consider both options.
Installation will not work if the input is connected to the line output from the computer sound card or headphone output does not work!
During these experiments, it became clear that the chip can be adapted to the two modes of operation, the first of which is already listed above - flashing LEDs individually, besides flashing corresponds to the input frequency range, the stronger low frequency, the higher the LED lights pole.
The second mode - joint flashing. In this mode, all the LEDs light up together. In this case, the output of the power amplifier and connect the negative input of the indicator.
In the first scheme, the construction of the variant of the indicator on a single chip. The effect is not very entertaining, but I advise you to start to collect that way, and then if everything is working properly, and you can connect a second chip.
In the video clip demonstrated the operation of a single chip, the LEDs are working together, then there is a circuit connected to the second embodiment.
Indicator is able to work together with any power amplifier, regardless of the supply voltage of the amplifier power, only do not raise the maximum allowable stress indicator, which is 30 volts.
In those cases where you need to combine the light with an amplifier that runs on dual supply, you need to use a voltage of 12 to 24 volts.LEDs fit literally any colors to your taste, you can apply one color LEDs, you decide.
Variant of the indicator on two chips:
To display operated in the "column", you need to connect the output of the amplifier plus the power supply indicator and an input razhim this can only be used when the power amplifier and the indicator powered from a variety of sources, otherwise there is a danger of burn VLF output stage!
Original article sourse cxem.net
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