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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Ocean Sound Generator (CB25489E)
This circuit called “surf man” was published in the August 1992 Radio Electronics magazine. It...
Shields Grove for Intel® Joule ™
April 2017 - The Shields of Seed Grove Modules for Intel Joule can now be obtained from Mouser...
Voltage Controlled Current Regulator I (CB19943E)
This circuit was found in documentation from the 1980s. The transistor depends on the desired...