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Detector And Controller

2015-03-02 22:50  
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Many applications require analog signals to be sensed and digital signals to be controlled. A way to detect these p
Detector And Controller

oints is by using a 555 timer in an unconventional configuration. This method will also add hysteresis to the circuit and guard against oscillation. The 555 supplies two comparators and a flip-flop eliminates the oscillation. Using this classic timer in the new configuration also reduces the component count. The circuit shows the 555`s trigger and threshold pins tied together. This enables the comparators to set and reset the flip-flop. Op amp U2 supplies both the trip-point setting and a way to adjust the hysteresis for on and off points. One application where this circuit would be useful is in a Nicad battery-charge controller.



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