Wien-bridge-filter


Posted on Jun 14, 2012    10068

Most audio tone controls affect midband gain, and !bey often create booming or hissing sounds when activated. You can avoid tbese problems by using a dual Wien-bridge filter to provide independent control of tbe treble and bass frequencies. Experiments witb equalizers indicate that tbe optimum center frequencies are about 100 Hz and 8 kHz.


Wien-bridge-filter
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Using the relation/= (21fRC)-1, set the Fig. 1 values accordingly: 100Hz: R1 = 15 KO; C1 0.1 p,F 8kHz: R2 = 16 KO; C2 1.3 nF R3 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.




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