Logic level tester circuit 2
Source: InternetPublisher:fish001 Keywords: logic level tester light emitting diode Updated: 2021/10/20
It uses LM324 operational
amplifier A as the voltage comparator. When the input signal is high level
(compared with the threshold voltage set by potentiometer RP), the red light -emitting diode VLi in the three-color light-emitting diode VL
lights up, and VL2 does not light up; when the input signal is low level, the green light-emitting diode VLz lights up, VLi does not light up; when the input
terminal is a pulse signal, VLi and VLz flash alternately; when the frequency is higher, the luminous tube turns orange-red.
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