This circuit is from an American 80's documentation. The integrated circuit is from the time and the sensor consists of a smoke chamber measuring its transparency change.
We found this circuit in an old American documentation. The circuit is suitable for motorcycles and...
This circuit for low voltage motors was found in an Electronics Now from the 90's. The transistor must...
This antenna for the frequencies 146 or 440 MHz was found in a magazine 73 for Amateur Radio of...