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Consumer Electronics by S. P. Bali

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LOW-PASS/HIGH-PASS FILTER

The circuit of a low-pass/high-pass filter is shown in Fig 18.7. It consists of two RC networks connected in series with a buffer amplifier.

The adjustable frequency characteristics are shown in Fig. 18.8. The following frequency limits can be selected.

Lower frequency 40, 80, 160 and 270 Hz; upper frequency 11, 9, 4.5, 3.2 kHz.

 

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Fig. 18.6 Sound source width (dimension) control circuit

 

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Fig. 18.7 Low-pass/high-pass filter circuit

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