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Three-Way Touch Lamp
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A three-way switch to control a lamp (off-dim-bright, etc.) uses an NE555 timer to generate a one-second pulse, triggered by ambient ac fields that are picked up by the human body. C1 and D1 form an input network. U2 is a decode counter/divider and drives one of 10 outputs (three are used). The logic outputs drive various resistors in series with the LED in the optocoupler. The optocoupler controls a triac that is in series with a load (lamp, etc.).

By reconfiguring the outputs of U2, more than three brightness levels can be obtained, up to 10. An 1N914 and resistor will be required for each output.


Parts List:
Component: Value: Datasheet: Qty:
Resistor

5.1K

 Not Available 01
Resistor

2.4K

 Not Available 01
Resistor

1K

 Not Available 01
Resistor 180 Not Available 01
Capacitor 0.27uF Not Available 01
Capacitor 100uF Not Available 01
Capacitor 0.1uF Not Available 01
Diode 1N4001 Available 01
Diode 1N914 Available 03
Triac 400V, 6A Not Available 01
IC 555 Available 01