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Hey guys, here's a circuit that's easy to experiment on here in EC, but might be a bit troublesome in reality. By bootstrapping the resistor tail, you can create a notch filter for a specific frequency, which with amplifiers running on 50Hz (100Hz after rectification), would be a good feature. Mains frequency doesn't vary a lot, plus if you add a series resistor to the 220uF cap, you decrease the Q factor and you can control the notch depth and expand the effective range of the notch a bit, thus covering a wider range. This is also beneficial if you can't pinpoint the components perfectly to notch it at 100Hz. It sacrifices a bit of the suppression, but at - 90dB, that's not something you'd care about.
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