This is a PCB with OLED, LaserTag, two Radio Receivers, Oscillotor, Sound Card for PC, Smoke Detector, LEDs, Maze Game, Accelerometer, Motor/Speaker Drivers, two Proximity Detecters, Thermometer, Photo Detector, Etc.
An open source credit card sized DC/DC converter to convert up to 600 V to 24 V in a energy-, cost- and space efficient way.
Rootthecause
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