Optocoupler Operation as Switch Tutorials with Design Sample

The optocoupler operation as switch is similar on how to configure BJT as switch. For a BJT to operate as switch it must be set to function in saturation and cut-off. Optocoupler as well. However in BJT circuit the base current must be high enough to drive the transistor into saturation; but in Optocoupler it is the forward current. In

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