We shall now describe electronic device for the small conductive surfaces, in particular pedagogic or play in order to test the knowledge comprising such a device.

摘要

The device consists of a body 1 comprising: - an insulating member 3, one side of which protrudes from the body 1 and the other side of which penetrates the body 1; - two electrical contacts 4, 5 at the outer end of the member 3 and connected to an electronic circuit 60 comprising a capacitor 6, a double oscillator 7, a resonator 8 and a battery 9; - two electrical contacts near the inner end of the insulating member 3, connected to the battery 9 to form the power supply circuit; - a circuit breaker actuated by the displacement of the member 3 in the body 1. IMAGE