Amazon.co.jp: ULTECHNOVO Time Current Control Panel Welding Machine Time Control Board Spot Welder Pcb Circuit Board Digital Display Controller Spot Welding Pcb DIY Welding Equipment : DIY, Tools & Garden
spot welder 555 timer - EasyEDA open source hardware lab
spot welder design using microwave transformer. advice on use of relays, capacitors, and timer circuits would be appreciated. more info in comments. : r/AskElectronics