Precision double controller Digital display provides a clear timing readout for accurate and stable control. Encoder adjustments offer improved precision and longer service life compared with traditional potentiometers. Enhanced design and easy installation Double sided welding design with optimized component layout for easier integration. Easier to fit inside standard machine housings, reducing installation time and effort. Multi function and flexibility Supports adjustable single and double welding settings. Includes welding count, synchronous triggering, and poweroff saving functions. The 41A thyristor version can control transformers below 1000W. AC transformer requirements Must be powered by an AC transformer in the 12V to 17V range. Not compatible with DC power supplies. Practical use scenarios Battery pack assembly: achieves consistent, repeatable welds when joining small metal tabs or battery pouches with adjustable timing to prevent overheating. Electronics enclosure or thin metal work: provides precise spot welds on delicate sheets, improving reliability in smallscale fabrication or . Upgrading existing welders: easy to retrofit into machine housings with improved control, enabling smoother operation and energy saving during production runs. Compatibility and notes Intended for spot welder machines that require a time control board powered by AC input. The 41A thyristor version enables control of transformers below 1000W. Not compatible with DC power supplies.