These are some simple circuits, site disclaimer applies to all this as well.

• Light a Bulb circuit
• Light an LED circuit
• Light a Bulb or LED and have an on/off switch
• Build a door buzzer
• Build a 2-way Lightswitch
• Experiment with resistors
• Build a light level indicator
• Experiment with logic gates and build a simple burglar alarm
• Experiment with combinations of logic gates and build a combination game
• Build a timer using a 555 chip
• Build a flashing light circuit with a 555 chip

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