three-level touch control (CB7040E)

Found in Popular Electronics this circuit uses common components to control an incandescent lamp with three levels of intensity

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Ramp Generator with Variable Reset Level (CB6352E)
We found this circuit in documentation from Linear Technology of the 80s. The circuit uses...
Drum (CB9094E)
This circuit generates damped sounds imitating a drum or other percussion instrument with...
Light Sensor (CB5973E)
This circuit can use any comparator or even an operational amplifier. We can use the LM339 and the...