The purpose of this circuit from a 1995 publication. Its purpose is to alert a person when he leaves his home that he left the door without locking. X1 and X2 are sensors that are installed between the key and the handle in such a way that they break when we remove the key from the door after closing it from the outside. If this does not happen, the circuit will start to emit a signal.
| Clique na imagem para ampliar |
