336x280(권장), 300x250(권장), 250x250, 200x200 크기의 광고 코드만 넣을 수 있습니다.
http://www.engineersgarage.com/555-timer-circuits
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http://www.free-energy-info.co.uk/Ch12/Fig163.gif
https://www.youtube.com/watch?v=74fz9iwZ_sM
▼사각&삼각&사인파형
http://www.seekic.com/circuit_diagram/Sensor_Circuit/Mutiple_Waveform_Generator_Circuit.html
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