Feedback Bandpass Filter

Posted on Jan 25, 2013

These filters are useful for equalisation, analysis and other tasks such as the Sound to Light converter (Project 62) or even a fully functional Vocoder. For those who have not heard of the vocoder, it is a device that takes a music source as one input and vocals as the other, allowing a guitar, keyboard or complete ensemble to be made to speak or sing. The `speech` from a good vocoder is quite intelligible, and is `ear candy` of the very best kind for experimental musicians.

Feedback Bandpass Filter
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The source impedance must be low with respect to the input resistance, and normally these filters are driven from an opamp buffer. If a high impedance is used, it adds to the total input resistance, causing unpredictable centre frequency and response. The

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