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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Electronic Time Mark (CB16302E)
Waking up to a loud and clear sound from an audio oscillator, after up to 5 hours of sleep, or...
Volume Control (CB19186E)
This circuit was found in a publication from the 90s. The circuit can be assembled with modern...
400 Hz 741 Oscillator (CB17028E)
This conventional oscillator with the 741 can be precisely adjusted to produce a 400 Hz signal. The...