The simplest multivibrator circuit composed of the photocoupler

Published:2011/8/25 7:39:00 Author:Nancy | Keyword: multivibrator , photocoupler | From:SeekIC

The figure1 is the simplest multivibrator circuit composed by the photocoupler. When the power is on, because the voltage across C can't break and the value of R is greater than RL, the power supply Ec is mainly added on the R, the electric potential at point F is very low, LED is at off state, with the charging voltage of capacitor increasing, the electric potential at point F is increasing gradually to a certain value to make LED conduct and flash, and make phototriode conduct and saturate, the output voltage jumps close to the power supply, but the left charge of the capacitor discharges quicky through phototriode and LED.



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