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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Comparator With Op. Amp. (MSB069E)
This simulation shows how to use an operational amplifier as a voltage comparator. The sample uses the...
Telephone Conversations Automatic Recording (CB17296E)
This circuit automatically activates the relay when the phone is answered, closing the record...
Vehicle Alarm (CB4867E)
This car alarm was found in an American '80s documentation. The circuit automatically activates...