The circuit I have is simply a comparator, 1 resistor and 1 capacitor - It seems very simple, but I can't think of the correct search string for Google to find more info.
The 2 comparator inputs are joined by a resistor and one or other of the inputs has a capacitor to GND.
The general idea is; the voltage on the capacitor becomes Vref, but because of the path through the resistor to the input, the capacitor voltage tracks the input - I can't remember if that's average, mean or whatever, but you get my "drift".
The whole point being; the comparator ignores slow changes and only responds to events that deviate rapidly from the drifting level.
All I need is; what its called so I can Google.
Thanks.
The 2 comparator inputs are joined by a resistor and one or other of the inputs has a capacitor to GND.
The general idea is; the voltage on the capacitor becomes Vref, but because of the path through the resistor to the input, the capacitor voltage tracks the input - I can't remember if that's average, mean or whatever, but you get my "drift".
The whole point being; the comparator ignores slow changes and only responds to events that deviate rapidly from the drifting level.
All I need is; what its called so I can Google.
Thanks.