Circuits for long-distance transmission and biometric devices, access control systems

Abstract

The invention discloses a circuit for remote transmission and a biological recognition device and access control system.The circuit comprises the electric level input end, a first resistor, a second resistor, a first switch, a second switch, a third switch and the electric level output end; the electric level input end is connected with the control end of the first switch through the first resistor, the first end of the first switch is connected with a power supply through the second resistor, the second end of the first switch is grounded, the first end of the first switch is connected with the control end of the second switch and the control end of the third switch, the first end of the second switch is connected with the first end of the third switch, the first end of the second switch is connected with the electric level output end, the second end of the second switch is grounded, and the second end of the third switch is connected with the power supply.In this way, the problem that transmitted signals generate quality deformation due to the fact that the signal driving capacity of the remote transmission circuit is poor and other problems are solved.

Description

technical field [0001] The invention relates to the technical field of electronic circuits, in particular to a circuit for long-distance transmission, a biometric identification device, and an access control system circuit. Background technique [0002] Usually electronic access control equipment mainly uses Wiegand signals for data transmission, but the transmission distance of ordinary TTL signals is within the range of meters. For common electronic access control equipment, the distance between the identification control terminal (usually fingerprint, iris and other collection and comparison equipment) and the door lock control terminal (directly controlling the switch of the door lock through the access control controller) is relatively close, and the above technology can meet the needs of daily life. However, in places or fields with extremely high security requirements such as finance and national defense, the door lock control terminal usually needs to be placed in a ...

AI Technical Summary

Problems solved by technology

[0005] In order to solve technical problems such as poor signal drive capability during long-distance transmission in the prior art, the present invention provides a circuit for long-distance transmission, including:

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