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A pulse method to change the state from on to off or vice versa.
This is a change in the content of solder. Lead free solder is generally recommended due to Health and Safety considerations, but 60:40 tin:lead is preferred for electronic kits and is still available from suppliers such as Rapid Electronics.
A German dcc system and decoder manufacturer
A DCC decoder made especially for lights for a loco or carriages.
In a model railway it is a way to do step by step sequence to make the train do what you require.