Electronic volume and tone control on the K174XA54 chip. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Tone, volume controls

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We consider the scheme of the volume control, balance and tone on the domestic chip K174XA54, manufactured by Angstrem OJSC. And then all Sony, yes Philips ... we'll show them! Yeah.

The microcircuit is a volume, tone and balance control for a stereo signal. That is, one chip is enough for two channels. Also, the chip provides LED indication of operating modes and loudness.

Main characteristics

Supply voltage, V. . . . . . . . . . 2,1…6
Consumed current, mA. . . . . . . . . . . ten
Volume control range, dB. . . . 70
Volume control step, dB. . . . . . 1,4
Timbre control range, dB. . . . . +/-12
Tone control step, dB. . . . . . . . 1,5
Balance adjustment range, dB. . . . . 12
SOI, %. . . . . . . . . . . . . . . . . . 0,05

scheme

(click to enlarge)

And no variable resistors, comrades! Forget! All operations are carried out with buttons S1-S4. The choice of the parameter to be adjusted is carried out by pressing the S2 button. Adjustment of the selected parameter - buttons S1 and S3.

By default, the chip is in volume control mode. When you press the S2 button, the mode is switched in a circle: Volume -> Bass Timbre -> Treble Timbre -> Balance -> Volume. Return from any mode to the Volume mode occurs when no buttons are pressed for several seconds. Loudness is turned on with the S4 button in the Volume mode. And in the Bass Timbre or Treble Timbre mode, pressing this button returns the tones to the 0 dB level. It's just a holiday!

Well, the HL1-HL4 LEDs will remind you of the selected operating mode.

Plate with a list of elements

Publication: radiokot.ru

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