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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Pulsed tone buzzer (CB8969E)
This circuit was found in 1980s American documentation. The transducer is a piezoelectric capsule and the...
Up to 30 MHz RF preamplifier (CB20227E)
This circuit from the 80s uses an integrated circuit from the time. The CI is difficult to find...
Receiver Circuit with RF Stage (CB19266E)
This receiver, which, depending on the coil, can receive medium or short waves, was found in a...