Published:2011/9/9 7:54:00 Author:Vicky | Keyword: Schematic and applied circuit diagram, pulse circuit composed of photoelectric coupler | From:SeekIC
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When Ec is just on in picture 1(a), Up increases when C is charging. When UF≈1, luminous diode and then the triode become saturate, and output Uo≈Ec.
When triode becomes saturate, C discharges (through two route: C→F→E1→Er and C→RF→+Ec→R ). Uo becomes lower. The diode stops when c discharges to a certain degree. The triode stops subsequently after moving all the memory electric charge, and uo becomes zero. Power Ec charges C again after triode stops, and the above process repeats again. Thus the peak output wave is obtained, and the cycle is (when RF》Re ): T=C(RF+Re)In2
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