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In Simple words ... (This is an active-low circuit; so active here means low, but for an active high circuit, active would mean high) SR Latch Circuit A flip-flop, on the other hand, is a synchronous ...
Check out this interesting wideband AC millivoltmeter circuit from 1990. The simple design features 12 ranges, decent accuracy, 200 µV accuracy, and a frequency range from 20 Hz to more than 2 MHz.