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 ...
I just got a note from the irrepressible Julie Day over at Texas Instruments that they have just released a revision of FilterPro, their popular active filter design tool. I talked about the tool in ...
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