Door light emitting logic circuit with CD4069

  
Logic pen also known as logic detection probe, it is a common tool in the digital circuit detection logic state of each point. Digital circuit logic state is generally divided into three types: namely, a high level "l", the low level "0"
Door light emitting logic circuit with CD4069 - schematic

and "high impedance" (floating). The logic state of the test results by the light emitting diode display, can also be used to prompt the sounder, but also with a digital light-emitting diode displays. Shown for the use hex inverter CD4069 light emitting diode logic detecting pen.




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