Passage Alarm with High Power Output (CB25485E)

This circuit was found in the July 1992 Radio Electronics magazine. The output circuit must be equipped with a heat sink.

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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...