Simplified logic checker. Logic voltage levels have the ability to display LED (Of course I (^_^;).` H `in the LED is green,` L `and red LED lights, and so both the open and goes out .
But not only that was put on the ability to detect narrow pulses. In doing Shottomaruchibaibureta be extended to a short, pulse, this pulse of about 100ns in LED flash you can see it. This is handy for checking the presence of the signal and strobe.
Indicator Red LED + green LED
Threshold voltage Red light: 1.5V or less
Green light: 2.5V or more
Pulse detection In
Power AAx3 (4.5V), 1mA
Production costs \ 1,000 or less