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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Receiver for Heart Rate Monitor (CB25407E)
This is the receiver for the previous circuit found in the November 1991 Radio Electronics...
Receiver for FM Infrared Audio Link (CB20978E)
This circuit was found in a Popular Electronics from the 90s. The components admit equivalents and the...
Bargraph Voltmeter LM3914 (CB4959E)
This circuit for the car can be found in other versions in this section. This is from an 80's...