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In this video, we will go through the whole journey of a small tinkering project together from the idea, through the circuit design, the printed circuit diagram, mounting and covering to the final test. The video is longer, so I will give you its content here so that you can more easily return to the part that interested you. 0:05 - Opening monologue 1:35 - Circuit requirements specification 3:08 - Basic design 5:05 - Logic design 14:08 - Power switch design 15:41 - Component value selection 25:36 - Cosmetic modifications 28:18 - Field Test 29:15 - Complete Schematic in KiCAD 33:10 - Case Assignment 35:13 - Layout on the Board 38:12 - Interconnecting 42:25 - Ordering PCB Factory Production 44:16 - Board Mounting 45:40 - Testing safe voltage 47:08 - Covering 48:15 - Overall test 49:08 - Epilogue WARNING: The procedures presented in this video, if repeated incorrectly, can lead to dangerous situations. Therefore, it is important to consider your abilities before starting work with electricity, to work carefully and to think at work. I take no responsibility for any damage to health or property.