A notch for a narrow frequency band of a few per cent or even less normally requires close-tolerance components. At least, that’s what we thought until we came across a special opamp IC from Maxim. In ...
The circuit was designed with the combination of high pass filter and low pass filter to create a notch filter circuit. High Pass Filter – an electronic circuit that allows the passage of high ...
The (Henry P.) Hall network is a widely tunable notch filter,tuned by a pot. It was a key part of the GR1232A (1961) It's still useful today. Here's how to design one. Fig 1. Shown is the original ...
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