Brems-Chopper is a brutally brushed-motor-based electric bicycle named after the giant Infineon IGBT module that goes between the battery and the motor. The module was designed for electric braking of subway trains, and is referred to in the datasheet in German as a Brems-Chopper (English: Brake-Chopper).
1: a hastily built electric bike needs more power. the first Brems-Chopper motor controller is made
2: this thing goes fast. a board is etched and a proper motor mount is made
3: the pack voltage continues to rise, and the front wheel is replaced with a ski for winter
4: motor inspection, laptop brick as isolated DC/DC converter, disc brake, headlight
5: snow fun and motor fire
6: motor swap and more snow. strange brush failure