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How to connect a relay through an opto coupler homemade circuit projects electrical relays work basics does learn mro electric do explain that stuff 12v based timer switch using bc547 transistor latching schematic sensor data activate 5v on the arduino clap with control electronics raspberry pi guide driver uln2003 and its applications works n o c pins set up advantages of automation plc programming scada pid system in depth interface two channel module what is omron electronic components asia pacific simple diagram mechanical primer phidgets support use one low cur triggered 2n3904 transistors wire definition working principle construction globe short protection for batteries project phototransistor light controller eleccircuit formula calculations it codrey introduction engineering practical circuits dc this optocoupler general forum when realpars tutorial code day computer makerguides com automotive they buildcircuit automatic off proteus isis design application operate 24v from ko4bb