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Simple-window-detector

2015-01-10 20:40  
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This simple window detector uses only half of a 7400 quad NAND gate plus four resistors, chosen so that the voltage at point A exc.,eds the voltage at point B for any input voltage. With no input applied or when VIN is at ground, the output of gate Gl is one; hence G2`s output is also one. As the input voltage increases, VA rises faster than JOB.
Simple-window-detector

When Va reaches an acceptable one level, the circuit`s output drops to zero. As the input continues to increase, JOB rises to an acceptable level, changing the output of G2 to one.



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