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STK301-220 bảng dữ liệu(PDF) 5 Page - Sanyo Semicon Device |
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STK301-220 bảng dữ liệu(HTML) 5 Page - Sanyo Semicon Device |
5 / 8 page 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 M Ω 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 = Figure 2 Resonance Circuit 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 3 Equivalent Circuit No. 4793-5/8 STK301-220 2 π 1 C1 · C2 · R1 · R2 |
Số phần tương tự - STK301-220 |
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Mô tả tương tự - STK301-220 |
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