Optocoupler level conversion circuit diagram

Published:2011/9/27 20:56:00 Author:Rebekka | Keyword: Optocoupler level conversion | From:SeekIC

For different level conversion circuits, or input, output circuits , ifits levelneeds to be separated, it is more convenient to use optical couplers.Figures(a) and (b) circuits are 5V power supply TTL IC and 15V power supply HTL IC. Each circuit is connected and conducted level. In figure (a), when TTL gate circuit turns on, it outputs low level, then the light-emitting diode turns on, phototransistor outputs high level; TTL gates close, then the light-emitting diode cuts off, phototransistor outputs low level. In figure (b),it uses TTL outputs high level, light-emitting diode turns on, photo transistor outputs low level; TTL conduction outputs low level, then LED isoff, and phototransistor outputs high level.



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