This circuit for medium and short wave range was found in an American documentation from 1992. The circuit can use general purpose transistors and the antenna can be external or telescopic.
We found this circuit in the August 1994 issue of Electronics Now. The 4046 is unusual today. The...
This signal conditioner humidity sensor was found in a 1980s Linear Technology documentation. The circuit...
The battery is charged by the photocell that keeps the low consumption beacon in the dark. The...