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
Click here to download the full size of the above Circuit.

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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