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Experiment 2 - The Optocoupler II

With an optocoupler you are able to use two completely isolated circuits. Nevertheless, you are still able to send a signal from one circuit to the other.

In the circuit shown, you use two circuits, each operating at 9 Volt...

Circuit optocoupler with two separate circuits. (Enlarge)

Circuit diagram optocoupler with two insulated circuits.

The circuits must not necessarily be operating at 9 Volt. You are free to choose each circuit, as long as they are within the limits as described in the data sheet. This is precisely the strength of an optocoupler.

In the next experiment, you look at how an optocoupler works without casing...

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