STK301-220 데이터 시트보기 (PDF) - SANYO -> Panasonic

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STK301-220

7-band, 2-channel Electronic Graphic Equalizer

SANYO -> Panasonic 

STK301-220

Pins f (1) through f (7) are used as pin connections for the

LC7522 band filter. Supported frequencies and their pin

assignments are listed in the following.

Pin Name Frequency

f (1)

60Hz

f (2)

150Hz

f (3)

400Hz

f (4)

1kHz

f (5)

2.5kHz

f (6)

6kHz

f (7)

15kHz

In order to minimize the noise which occurs during changeover,

connections are made using 1 MΩ resistors from pins f (1)

through f (7) to 1/2 VCC1.

Resistor Equivalent Circuit

(single band)

Principles of Operation

The graphic equalizer section is constructed from 7 resonance circuits and output buffer amplifiers (every channel);

variable resistors (LC7522) and resonance circuit capacitors C1 and C2 are built-in. Resonance circuits utilize

semiconductor inductors and apply resonation to reduced impedance; all frequency gains are altered.

1. Resonance Circuit

Semiconductor inductors replace the L of the R, L, C series

resonance circuit with a CR element passing through the

buffer function of active elements such as the transistor and

op-amp (operational amplifier), thereby effecting the

equivalent operation of a R, L, C series resonance circuit.

The STK301-220 resonance circuit buffer is constructed

using transistors and arranged as illustrated in Figure 2.

Resonance frequency fo is determined using the following

formula:

fo =

1

2π C1 · C2 · R1 · R2

2. Flat, Boost and Cut

Gains matching resonance circuit frequency gains are altered

by altering the built-in resonance circuits and electronic

volume control. Figure 3 is presented to describe the

equivalent circuit. Z represents the impedance of the

resonance circuit in Figure 2.

Figure 2 Resonance Circuit

Figure 3 Equivalent Circuit

No. 4793-5/8

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