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NE555 array dual-pulse generation module

 
Overview
This is a 4-series NE555 pulse generator with adjustable pulse widths of 0.1-1ms and 1-10ms, suitable for spot welding machines. The key is triggered by a falling edge;
the first 555 has a 500ms delay, the second is a pre-welding pulse, the third is a delay pulse, and the fourth is the welding pulse. The outputs of the second and fourth 555s are connected to the pulse output via diodes.
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