Winter Field Day, Summer Field Day, "Summits On The Air" with W7MRC, Amateur Radio, Rhodesian Ridgebacks, Field Craft, Living in Montana, Old 4 Wheel Drives, Old Tube Radios, Hiking and "Just Getting Out There"
Thursday, December 30, 2021
How Optocouplers work - opto-isolator solid state relays phototransistor
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