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Company Logo NXP Semiconductors

  • Three-Way Touch Lamp

  • Created: Mar 03, 2014

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Summary

A three-way switch to control a amp (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 decade counter/divider and drives one of 10 outputs (three are used). The logic output 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.).

2 Comments

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Colin55

How can 2 ohms make any difference?

Posted: Mar 04, 2014

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NXP

We've just made an update to the values. Thank you for taking time viewing the designs. God Bless.

Posted: Mar 24, 2015

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