Six-band graphic equalizer. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Audio equipment

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The proposed equalizer differs from most similar ones in the ability not to be overloaded even with the full rise of all controls. Also added one more tone control band: ultra-low frequencies - 30 Hz. The best confirmation of the high quality of this microcircuit is its use in almost all components of the PANASONIC radio tape recorders.

A six-band equalizer is easily converted to a five-band:

1) Elements R8, R22, R23, C27, C28, C29 and C30 are not installed on the board.

2) C15 and C26 are not set to 0,47 mF (0,68), but 1 mF (if the capacitor is polar, then + to the microcircuit)

So the resonance of this shifts from 100 to 63Hz.

Specifications: Upp = +4…+16V Upp optimal +9…+14V Uin = up to 500mV Uout up to 1mV Fwork = 10….25000Hz (±3 dB) Kharm = 0,05% Ip = 10..12mA Ksignal/noise > 80dB Rin = 100kΩ Rout = 10kΩ Custr = 1 (with linear frequency response) Crosstalk attenuation between channels > 45dB Tone control range = ±12dB

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