AVT5138 A +

We present a four-channel hi-fi audio mixer, digitally controlled and equipped with a one-way MIDI interface. It is not a complete system that can work with different types of sound sources, but it will be successfully used as a base for building an advanced amateur console.
The device is assembled on two printed circuit boards. The AT89C4051 microcontroller is responsible for controlling the audio track. To adjust all settings (independently for each channel) and operation of the device, two microswitches and a very easy to use pulse generator are provided.
The MIDI interface implemented in the mixer deserves attention. For example - after connecting the mixer to a synthesizer, sequencer or music card, you can use the MIDI interface to control all device parameters. The operating commands sent in this way will have priority over the settings selected using the pulser.

The device is especially recommended for musicians and devices users with MIDI interfaces

Selected parameters:

• four inputs, one output (stereo)
• maximum level of the input signal <2Vrms
• output level 3V
• input impedance 33kom
• THD 0.01%
• S / N ratio 106dB
• channel separation 103 dB (for f = 1kHz)
• gain adjustment 78.75 - 0dB (step 1.25dB)
• regulation of bass and treble -14 to + 14dB
• balance adjustment -38.75 -0dB (step 1.25dB)
• built-in MIDI interface
• built-in 4x16 alphanumeric LCD display (with backlight)
• power supply - 12-14 Vdc
• tile dimensions 102x116mm
• a printed circuit board, programmed layout and documentation in the set
  Detailed description in EP 06/08