Abstract: The present invention provides a nucleic acid extraction instrument including a base, an outer housing connected with the base, and an instrumental main body positioned inside the outer housing and mounted to the base; and the instrumental main body includes an electrical power pack, a main control device, a first motor set, a second motor set, and a third motor set.

Abstract: The present invention provides a nucleic acid extraction instrument including a base, an outer housing connected with the base, and an instrumental main body positioned inside the outer housing and mounted to the base; and the instrumental main body includes an electrical power pack, a main control device, a first motor set, a second motor set, and a third motor set.

Abstract: The present invention provides a nucleic acid extraction instrument including a base, an outer housing connected with the base, and an instrumental main body positioned inside the outer housing and mounted to the base; and the instrumental main body includes an electrical power pack, a main control device, a first motor set, a second motor set, and a third motor set.

Abstract: A control system for garage door includes a motor, a controller controlling operation of the motor, and a keyboard for inputting an instruction into the controller. The keyboard includes a plurality of keys, a plurality of resistors, a divider resistor for sharing voltage, and a voltage signal output circuit. The resistors correspond to the keys. Each key is connected with one of the resistors in series to form a key mapping signal shunt. The key mapping signal shunts are connected in parallel to form a group of key mapping signal shunts. The divider resistor is connected with the group of key mapping signal shunts in series to form a series circuit. A driving voltage is applied on the series circuit. The voltage signal output circuit is for transmitting a voltage on the group of key mapping signal shunts to the controller.