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Specifications:

            8 stereo inputs

            Volume control over 80 dB in 64 steps

            Preamplification factor (0, 6, 12 or 18 dB) for each input individual adjustable

            Low and high frequencies +/- 14 dB adjustable, in 15 steps

            Volume, balance, tone and preamplification control with TDA7314

            Mute with 100 dB attenuation

            Two Record/Monitor outputs with two software on/off switch for each inputs

            Signal to noise ratio 98 dB

            Automatic off function without input signal for 10 minutes

            Two speaker outputs

            Attenuation of the speaker outputs from 0 to 37.5 dB in 32 steps,  individual adjustable

            Control with a few buttons and remote controller

            Remote control with RC5

            PC control with RS-232

            Standby LED

            Display: 1x24 characters LCD dot-matrix display

            User editable names for each inputs

            Backup with EEPROM of all adjustments

            Delay for speaker relays

            Power amplifiers built with National's LM3886 IC's and with hardware and software speakers' protection.

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Schematic&hex: 

  Because the concept is modular, there are 3 schematics:

          MCU schematic

          Buttons

          analog part  (preamp, output buffer, detector circuit.. )

HEX file (TDA7314RC5LCD_REV2A)

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Pictures  

Measuring

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loudness

bass

treble