Graphic equalizer on the LA3607 chip. Scheme, description

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Graphic equalizer on the LA3607 chip. Encyclopedia of radio electronics and electrical engineering

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

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Have you ever collected an equalizer, eh? Not? And why? Too complex circuits, too many elements and complex printed circuit boards? Well, it's not all that bad.

Below, I will tell you how you can assemble a very good equalizer with a minimum set of components that does not require any settings, with a mockingly simple printed circuit board, but at the same time having very decent parameters, quite worthy of a car amplifier or a small home complex. The basis of the equalizer is a specialized chip LA3607, produced by the well-known company Sanyo, or rather its division of semiconductor devices.

Equalizer Specifications

Supply voltage	9V
Current consumption in the absence of a signal	7mA
Number of adjustment bands	7
Adjustment depth	+/-12dB
Coeff. amplification	0,8
Coeff. harmonic distortion	0,02%

Let's see the diagram:

(click to enlarge)

So, in the diagram, there are two components - the microcircuit itself and seven band-pass filters, consisting of two capacitors and one resistor, which, in fact, regulates the gain or attenuation of the selected frequency. With the capacitors selected, the following bands are adjusted:

60Hz, 150Hz, 400Hz, 1kHz (push!) 2,5 kHz, 6 kHz and 15 kHz.

Of course, they can be converted to other frequencies. And for this there are very simple formulas:

The resonant frequency is calculated as follows:

f=1/(2p*square(C0*C*R0*R))

Since R0 and R are hidden inside the microcircuit and are equal to 1,2 kOhm and 68 kOhm, respectively, the formula can be simplified to the following:

f=1/2n*square(81,6*C0*C)

Values in the formula can be substituted either in microfarads and kiloohms, then at the output we will get kilohertz, or in farads and ohms, then we will get hertz.

Well, the quality factor of each filter is calculated as follows:

Q=square((C0*R) / (C*R))

Taking into account the circumstances described above, we get:

Q=square(square(57(C0 / C)))

The capacity in this formula can be substituted in anything - the quality factor is a dimensionless quantity.

You need to feed all this stuff from a stabilized source, which you can collect, for example, on KREN9A. Yes, by the way, I hope it is clear that the diagram shows a diagram of one channel, and if you have several of them - two, for example, then you need to assemble two of these identical channels.

Publication: radiokot.ru

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