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CH18 USB Time Control PCB Timer board for Coin Operated Machine USB devices Vending Machine Timer PCB - AliExpress
![Identifying the "Preset" Component in this 555 Monostable Timer PCB - Electrical Engineering Stack Exchange Identifying the "Preset" Component in this 555 Monostable Timer PCB - Electrical Engineering Stack Exchange](https://i.stack.imgur.com/DyJ3M.jpg)
Identifying the "Preset" Component in this 555 Monostable Timer PCB - Electrical Engineering Stack Exchange
![15B coin operated timer pcb controller control timer board for electrical vending /Water dispenser machine/Arcade game machine - AliExpress 15B coin operated timer pcb controller control timer board for electrical vending /Water dispenser machine/Arcade game machine - AliExpress](https://ae01.alicdn.com/kf/Sb2fef4ac1d1e4438b9241c1f72664959C/15B-coin-operated-timer-pcb-controller-control-timer-board-for-electrical-vending-Water-dispenser-machine-Arcade.jpg)
15B coin operated timer pcb controller control timer board for electrical vending /Water dispenser machine/Arcade game machine - AliExpress
![We installed this timer PCB yesterday and it got me thinking. Who are the technicians that troubleshoot and fix these boards. Is it us? : r/electricians We installed this timer PCB yesterday and it got me thinking. Who are the technicians that troubleshoot and fix these boards. Is it us? : r/electricians](https://preview.redd.it/07n1rohhj2y81.jpg?auto=webp&s=bd5b9c4fa6fdfcb0b737bcd86c94e3aecc60c653)