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Simple and reliable numerical control resistance box

A resistance box, reliable technology, applied in the direction of resistors, electrical components, etc., can solve the problems of inability to interface with the computer, the external terminals are easy to loosen, and the user is inconvenient, and achieves good application prospects, meets automatic measurement, and is reliable in operation. Effect

Inactive Publication Date: 2014-12-17
JIANGXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] At present, most of the traditional resistance boxes on the market adopt the knob structure, and the external terminal is easy to loosen or even fall off, and the reading is inconvenient, and it cannot be interfaced with the computer, which brings a lot of inconvenience to the user.

Method used

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  • Simple and reliable numerical control resistance box
  • Simple and reliable numerical control resistance box
  • Simple and reliable numerical control resistance box

Examples

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Embodiment example 1

[0016] Implementation case 1: When the ones button SB1 is pressed continuously, the When the level is high, the corresponding light-emitting tube lights up, and the output terminal of CD4041 and will go low and the corresponding switch and Closed, short circuit and its parallel resistance, the equivalent resistance of the resistor network port is . At this time, the light-emitting tube lights up to display the corresponding resistance value, which is convenient for the user to read.

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Abstract

The invention discloses a simple and reliable numerical control resistance box. A clock pulse signal is in wireless connection with decoding output of a counter circuit; the decoding output of the counter circuit is connected with a diode network and an LED indicator lamp; the diode network and the LED indicator lamp are connected with an in-phase / reverse-phase driving circuit; the in-phase / reverse-phase driving circuit is connected with a switch selection circuit; the switch selection circuit is connected with a precise resistance network; a power supply is used for respectively supplying power to electric equipment. The simple and reliable numerical control resistance box has the beneficial effects that selection of the precise resistance network is achieved through normal reliable integrated chips, so that different resistance values under different demands are obtained, the selection of digital resistance is achieved through a button switch, the operation is reliable, and the cost is low.

Description

technical field [0001] The invention relates to a numerically controlled resistance box, in particular to a simple and reliable numerically controlled resistance box. Background technique [0002] At present, most of the traditional resistance boxes on the market adopt the knob structure, and the external terminal is easy to loosen or even fall off, and the reading is inconvenient, and it cannot be interfaced with the computer, which brings a lot of inconvenience to the user. From the perspective of practicality and operability, this technology proposes a design scheme of a resistance box that can be continuously changed under the control of a clock signal. This technology is simple, reliable and practical, and the resistance value can be changed by the user's continuous operation of the button switch. , is very convenient to use and is expected to have broad application prospects. Contents of the invention [0003] The purpose of the present invention is to realize the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01C13/02
Inventor 张国平甘朝松王君
Owner JIANGXI NORMAL UNIV
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