PC817 Optocoupler-How Does it Work?

mcasale

Joined Jul 18, 2011
210
These opto-couplers all work the same way, although the specs may vary. The LED provides light that activates the photo-transistor BASE (sort of). The output can be configured as common-emitter (most common) or common-collector. If the LED is turned off, the transistor turns off.
 
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