Accelerated Flashing LEDs with 4017 (CB25436E)

This LED special effects circuit was found in the February 1992 Radio Electronics magazine. The circuit uses 4 LEDs and is controlled by R3.

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Lie detector (CB7005E)
This simple lie detector was found in Popular Electronics. Transistors are commonly used. The...
Torque Control for DC Motor (CB5403E)
Found in the 2005 Linear Technology Application Manual, this circuit controls the torque of a...
Modulated CMOS Siren (CB10794E)
This circuit was found in the Italian magazine Radio Elettronica from September 1977. It consists of a...