Window Comparator

A comparator output simply responds to whether the signal is either higher or lower than a reference voltage. Window comparators set their output based on whether or not the signal voltage is close to the reference voltage.

Op Amp Window Comparator demo circuit using dual LM358 op amp learning electronics lesson 0066
Op Amp Window Comparator demo circuit using dual LM358 op amp learning electronics lesson 0066
  • Trimpot above 2/3 supply voltage sets top op amp low, so that LED lights up.
  • Trimpot below 1/3 supply voltage sets bottom op amp low, so that LED lights up.
  • Trimpot between 1/3 and 2/3 supply voltage sets both op amps high. So, LED stays off.

Video:

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