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WIEN_BRIDGE_FILTER

2016-05-14 11:50  
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WIEN_BRIDGE_FILTER
WIEN_BRIDGE_FILTER
WIEN_BRIDGE_FILTER
Most audio tone controls affect midband gain, and they often create booming or hissing sounds when activated. You can avoid these problems by using a dual Wien-bridge filter to provide independent control of the treble and bass frequencies.Experiments with equalizers indicate that the optimum center frequencies are about 100 Hz and 8 kHz. Using the relationf = (2πRC)-1, set the Fig. 1 values accordingly: 100 Hz: R1 = 15 KΩ; C1 = 0.1 μF 8 kHz: R2 = 16 KΩ; C2 = 1.3 μFR3 and C3 provide stability. You obtain a ± 9 dB variation of treble and bass by adjusting potentiometers R4 and R5, respectively. The filter's frequency response is shown in Fig. 2.