Digital volume control DD1 К555ИЕ7

The Digital volume control circuit has been designed to work with external wired remote has 16 levels of volume-driven volume up button and reset button. DD1 - counter displays 16-bit binary code to control the T shaped voltage divider. DD2 is used as a clock. DD3 inverts the signal from the counter. The regulatory element is made on resistors R6/R7, R8/R9 and transistor switches that are connected certain resistance to ground formed a T shaped voltage divider.

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Digital volume control MAX5440

Digital volume control MAX5440 makes this circuit does not require any special programming knowledge to work, because it works on the principle of "plug and play".

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Spectrum analyzer based PIC18F4550. Part 2

In the first part Spectrum analyzer based PIC18F4550. Part 1, we met with the scheme, with the appointment of individual nodes and elements, over the principles of operation.
Microcontroller software is written entirely in C language, and it can be conditionally divided into 4 parts.

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Spectrum analyzer based PIC18F4550. Part 1

The project demonstrates the implementation of the sound spectrum analyzer for 8-bit microcontroller PIC18F4550 manufactured by Microchip . Spectrum analysis is performed using an optimized fast Fourier transform algorithm (Fast Fourier Transformation, FFT), written entirely in C language. Data Visualization (spectrum) is carried out in real time on a graphical LCD display with a resolution of 128 × 64 pixels.

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LEDs Signal strength indicator on the amplifier

Does your audio amplifer have signal strength indicator? I've always envied the fancy amps with a graphical level meter signal on the LEDs, such that you can find a stereo system. This is your chance to design your own signal level meter, which you can connect to your audio amplifier and see how the signal.

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