Created by Andrew Entwistle on 17/06/2020 09:58:17
Spot welder using a Microwave Oven Transformer with secondary replaced with welding cable. Mains to primary switched using Arduino nano controlled solid state relay. Low power mode is switching a power resistor in series with primary. Potentiometer is read by arduino to set relay on time from 20ms to 500ms, always preceeded by a 50ms pulse.
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