logic gates, the NOT gate, with interactive javascript simulation.
logic gates, the AND gate, with interactive javascript simulation.
logic gates, the OR gate, with interactive javascript simulation.
logic gates, the EX-OR gate, with interactive javascript simulation.
Simple Digital up down counter CD4029, with interactive javascript simulation.
Astable 555 Timer, with interactive javascript simulation.
running lights with 555 and CD4017, with interactive javascript simulation.

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"when you solder the windows should be opened, cross ventilation must be good, because the fumes are not very good for health. After you finish wash your hands with soap, as lead is poisonous or toxic"
 
- Solderman    1702